P0103
Mass or Volume Air Flow Sensor A Circuit High
Causes
- Short or short to battery on MAF signal wire
- Faulty MAF sensor (internal electronics failure)
- Contaminated or damaged sensing element (dirt, oil, silicone)
- Poor or corroded connector or ground
- Aftermarket intake/filter causing incorrect airflow or static charge
- PCM/ECM fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) on
- High fuel trims or overly rich condition (poor fuel economy)
- Rough idle, hesitation, stumbling or surging
- Reduced engine power or limp-home mode
- Hard starting or stalling in some cases
What to check
- Read and record freeze-frame and live data with a scan tool (MAF volts, frequency or g/s, fuel trims, RPM, throttle position, intake temp).
- Visual inspection of MAF sensor, connector, wiring harness, and intake for damage, contamination, or oil-soaked filter.
- Backprobe MAF signal and reference wires with key ON (engine OFF) to verify reference voltage (~5 V) and ground integrity.
- Check MAF signal voltage at idle and while revving engine; look for stuck-high voltage or erratic spikes.
- Check for continuity or shorts between signal wire and battery 12 V with ignition off.
- Wiggle test harness/connectors while monitoring live data for intermittent changes.
Signal parameters
- Typical MAF signal voltage range: roughly 0.5–4.5 V (varies by sensor design).
- Idle signal often ~0.6–1.5 V; increases smoothly with throttle/RPM.
- Some MAFs report frequency or mass flow (g/s) instead of raw volts — expected trend: value rises smoothly with increased airflow.
- Reference voltage usually ~5 V (for sensor electronics) and a reliable ground are required.
- A persistent reading near battery voltage or a fixed high voltage is consistent with a P0103 condition.
Diagnostic algorithm
- Verify DTC and collect live data: confirm P0103 is current or historic and capture freeze-frame. Note related codes (fuel trims, IAT, MAP).
- Visual inspection: check air intake tubing, clamps, MAF mounting, and look for cracks, loose hoses, or obstructions. Inspect and unplug any aftermarket filter or intake components.
- Inspect connector and wiring: disconnect connector and inspect for bent pins, corrosion, pushed-out terminals, or contamination. Repair as needed.
- Measure voltages: backprobe signal, reference, and ground with ignition ON (engine OFF). Confirm reference ≈5 V, good ground, and that signal is not tied to battery voltage.
- Engine run test: with MAF connected, monitor signal while slowly revving engine. Look for a smooth rise; if signal is high or pegged, proceed.
- Check for short to 12 V: with ignition OFF, check continuity between signal wire and battery positive. If shorted, trace/repair harness.
- Clean and retest if contaminated: if MAF element is lightly contaminated, clean only with approved MAF cleaner and retest. Do not use other cleaners or touch element.
- Substitute test: if available, swap with known-good MAF sensor (same part) or test on bench per manufacturer procedure. Replace sensor if it remains high with wiring good.
- Verify PCM: if wiring and replacement sensor test OK but code returns, suspect PCM or module fault and consult manufacturer procedures before replacement.
- Clear codes and perform road test. Confirm code does not return and drivability/fuel trims are normal.
Likely causes
- MAF sensor contaminated or failed
- Signal wire shorted to 12 V or battery feed
- Dirty/oiled aftermarket air filter or intake contamination
- Loose, corroded, or damaged connector/ground
Fault status
Similar codes
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P0103
- High air mass meter reading
Causes
- Short or short to battery on MAF signal wire
- Faulty MAF sensor (internal electronics failure)
- Contaminated or damaged sensing element (dirt, oil, silicone)
- Poor or corroded connector or ground
- Aftermarket intake/filter causing incorrect airflow or static charge
- PCM/ECM fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) on
- High fuel trims or overly rich condition (poor fuel economy)
- Rough idle, hesitation, stumbling or surging
- Reduced engine power or limp-home mode
- Hard starting or stalling in some cases
What to check
- Read and record freeze-frame and live data with a scan tool (MAF volts, frequency or g/s, fuel trims, RPM, throttle position, intake temp).
- Visual inspection of MAF sensor, connector, wiring harness, and intake for damage, contamination, or oil-soaked filter.
- Backprobe MAF signal and reference wires with key ON (engine OFF) to verify reference voltage (~5 V) and ground integrity.
- Check MAF signal voltage at idle and while revving engine; look for stuck-high voltage or erratic spikes.
- Check for continuity or shorts between signal wire and battery 12 V with ignition off.
- Wiggle test harness/connectors while monitoring live data for intermittent changes.
Signal parameters
- Typical MAF signal voltage range: roughly 0.5–4.5 V (varies by sensor design).
- Idle signal often ~0.6–1.5 V; increases smoothly with throttle/RPM.
- Some MAFs report frequency or mass flow (g/s) instead of raw volts — expected trend: value rises smoothly with increased airflow.
- Reference voltage usually ~5 V (for sensor electronics) and a reliable ground are required.
- A persistent reading near battery voltage or a fixed high voltage is consistent with a P0103 condition.
Diagnostic algorithm
- Verify DTC and collect live data: confirm P0103 is current or historic and capture freeze-frame. Note related codes (fuel trims, IAT, MAP).
- Visual inspection: check air intake tubing, clamps, MAF mounting, and look for cracks, loose hoses, or obstructions. Inspect and unplug any aftermarket filter or intake components.
- Inspect connector and wiring: disconnect connector and inspect for bent pins, corrosion, pushed-out terminals, or contamination. Repair as needed.
- Measure voltages: backprobe signal, reference, and ground with ignition ON (engine OFF). Confirm reference ≈5 V, good ground, and that signal is not tied to battery voltage.
- Engine run test: with MAF connected, monitor signal while slowly revving engine. Look for a smooth rise; if signal is high or pegged, proceed.
- Check for short to 12 V: with ignition OFF, check continuity between signal wire and battery positive. If shorted, trace/repair harness.
- Clean and retest if contaminated: if MAF element is lightly contaminated, clean only with approved MAF cleaner and retest. Do not use other cleaners or touch element.
- Substitute test: if available, swap with known-good MAF sensor (same part) or test on bench per manufacturer procedure. Replace sensor if it remains high with wiring good.
- Verify PCM: if wiring and replacement sensor test OK but code returns, suspect PCM or module fault and consult manufacturer procedures before replacement.
- Clear codes and perform road test. Confirm code does not return and drivability/fuel trims are normal.
Likely causes
- MAF sensor contaminated or failed
- Signal wire shorted to 12 V or battery feed
- Dirty/oiled aftermarket air filter or intake contamination
- Loose, corroded, or damaged connector/ground
Fault status
Similar codes
P0103
Mass Air Flow (MAF) Sensor Circuit High Frequency
Causes
- Short or short to battery on MAF signal wire
- Faulty MAF sensor (internal electronics failure)
- Contaminated or damaged sensing element (dirt, oil, silicone)
- Poor or corroded connector or ground
- Aftermarket intake/filter causing incorrect airflow or static charge
- PCM/ECM fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) on
- High fuel trims or overly rich condition (poor fuel economy)
- Rough idle, hesitation, stumbling or surging
- Reduced engine power or limp-home mode
- Hard starting or stalling in some cases
What to check
- Read and record freeze-frame and live data with a scan tool (MAF volts, frequency or g/s, fuel trims, RPM, throttle position, intake temp).
- Visual inspection of MAF sensor, connector, wiring harness, and intake for damage, contamination, or oil-soaked filter.
- Backprobe MAF signal and reference wires with key ON (engine OFF) to verify reference voltage (~5 V) and ground integrity.
- Check MAF signal voltage at idle and while revving engine; look for stuck-high voltage or erratic spikes.
- Check for continuity or shorts between signal wire and battery 12 V with ignition off.
- Wiggle test harness/connectors while monitoring live data for intermittent changes.
Signal parameters
- Typical MAF signal voltage range: roughly 0.5–4.5 V (varies by sensor design).
- Idle signal often ~0.6–1.5 V; increases smoothly with throttle/RPM.
- Some MAFs report frequency or mass flow (g/s) instead of raw volts — expected trend: value rises smoothly with increased airflow.
- Reference voltage usually ~5 V (for sensor electronics) and a reliable ground are required.
- A persistent reading near battery voltage or a fixed high voltage is consistent with a P0103 condition.
Diagnostic algorithm
- Verify DTC and collect live data: confirm P0103 is current or historic and capture freeze-frame. Note related codes (fuel trims, IAT, MAP).
- Visual inspection: check air intake tubing, clamps, MAF mounting, and look for cracks, loose hoses, or obstructions. Inspect and unplug any aftermarket filter or intake components.
- Inspect connector and wiring: disconnect connector and inspect for bent pins, corrosion, pushed-out terminals, or contamination. Repair as needed.
- Measure voltages: backprobe signal, reference, and ground with ignition ON (engine OFF). Confirm reference ≈5 V, good ground, and that signal is not tied to battery voltage.
- Engine run test: with MAF connected, monitor signal while slowly revving engine. Look for a smooth rise; if signal is high or pegged, proceed.
- Check for short to 12 V: with ignition OFF, check continuity between signal wire and battery positive. If shorted, trace/repair harness.
- Clean and retest if contaminated: if MAF element is lightly contaminated, clean only with approved MAF cleaner and retest. Do not use other cleaners or touch element.
- Substitute test: if available, swap with known-good MAF sensor (same part) or test on bench per manufacturer procedure. Replace sensor if it remains high with wiring good.
- Verify PCM: if wiring and replacement sensor test OK but code returns, suspect PCM or module fault and consult manufacturer procedures before replacement.
- Clear codes and perform road test. Confirm code does not return and drivability/fuel trims are normal.
Likely causes
- MAF sensor contaminated or failed
- Signal wire shorted to 12 V or battery feed
- Dirty/oiled aftermarket air filter or intake contamination
- Loose, corroded, or damaged connector/ground
Fault status
Similar codes
Manual library for HUMMER
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
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HUMMER: 2009
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HUMMER: 2008
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HUMMER: 2007
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HUMMER: 2005
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HUMMER: 2004
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HUMMER: 2000
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HUMMER: 1993
P0103
Mass Air Flow Circuit High Input
Causes
- Short or short to battery on MAF signal wire
- Faulty MAF sensor (internal electronics failure)
- Contaminated or damaged sensing element (dirt, oil, silicone)
- Poor or corroded connector or ground
- Aftermarket intake/filter causing incorrect airflow or static charge
- PCM/ECM fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) on
- High fuel trims or overly rich condition (poor fuel economy)
- Rough idle, hesitation, stumbling or surging
- Reduced engine power or limp-home mode
- Hard starting or stalling in some cases
What to check
- Read and record freeze-frame and live data with a scan tool (MAF volts, frequency or g/s, fuel trims, RPM, throttle position, intake temp).
- Visual inspection of MAF sensor, connector, wiring harness, and intake for damage, contamination, or oil-soaked filter.
- Backprobe MAF signal and reference wires with key ON (engine OFF) to verify reference voltage (~5 V) and ground integrity.
- Check MAF signal voltage at idle and while revving engine; look for stuck-high voltage or erratic spikes.
- Check for continuity or shorts between signal wire and battery 12 V with ignition off.
- Wiggle test harness/connectors while monitoring live data for intermittent changes.
Signal parameters
- Typical MAF signal voltage range: roughly 0.5–4.5 V (varies by sensor design).
- Idle signal often ~0.6–1.5 V; increases smoothly with throttle/RPM.
- Some MAFs report frequency or mass flow (g/s) instead of raw volts — expected trend: value rises smoothly with increased airflow.
- Reference voltage usually ~5 V (for sensor electronics) and a reliable ground are required.
- A persistent reading near battery voltage or a fixed high voltage is consistent with a P0103 condition.
Diagnostic algorithm
- Verify DTC and collect live data: confirm P0103 is current or historic and capture freeze-frame. Note related codes (fuel trims, IAT, MAP).
- Visual inspection: check air intake tubing, clamps, MAF mounting, and look for cracks, loose hoses, or obstructions. Inspect and unplug any aftermarket filter or intake components.
- Inspect connector and wiring: disconnect connector and inspect for bent pins, corrosion, pushed-out terminals, or contamination. Repair as needed.
- Measure voltages: backprobe signal, reference, and ground with ignition ON (engine OFF). Confirm reference ≈5 V, good ground, and that signal is not tied to battery voltage.
- Engine run test: with MAF connected, monitor signal while slowly revving engine. Look for a smooth rise; if signal is high or pegged, proceed.
- Check for short to 12 V: with ignition OFF, check continuity between signal wire and battery positive. If shorted, trace/repair harness.
- Clean and retest if contaminated: if MAF element is lightly contaminated, clean only with approved MAF cleaner and retest. Do not use other cleaners or touch element.
- Substitute test: if available, swap with known-good MAF sensor (same part) or test on bench per manufacturer procedure. Replace sensor if it remains high with wiring good.
- Verify PCM: if wiring and replacement sensor test OK but code returns, suspect PCM or module fault and consult manufacturer procedures before replacement.
- Clear codes and perform road test. Confirm code does not return and drivability/fuel trims are normal.
Likely causes
- MAF sensor contaminated or failed
- Signal wire shorted to 12 V or battery feed
- Dirty/oiled aftermarket air filter or intake contamination
- Loose, corroded, or damaged connector/ground
Fault status
Similar codes
Manual library for ISUZU
Browse 116 ISUZU manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
ISUZU
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ISUZU: 2008
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ISUZU: 2006
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i-350
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ISUZU: 2005
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ISUZU: 2004
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ISUZU: 2003
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Ascender
-
P0103
High input of the mass or volume flow circuit
Causes
- Short or short to battery on MAF signal wire
- Faulty MAF sensor (internal electronics failure)
- Contaminated or damaged sensing element (dirt, oil, silicone)
- Poor or corroded connector or ground
- Aftermarket intake/filter causing incorrect airflow or static charge
- PCM/ECM fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) on
- High fuel trims or overly rich condition (poor fuel economy)
- Rough idle, hesitation, stumbling or surging
- Reduced engine power or limp-home mode
- Hard starting or stalling in some cases
What to check
- Read and record freeze-frame and live data with a scan tool (MAF volts, frequency or g/s, fuel trims, RPM, throttle position, intake temp).
- Visual inspection of MAF sensor, connector, wiring harness, and intake for damage, contamination, or oil-soaked filter.
- Backprobe MAF signal and reference wires with key ON (engine OFF) to verify reference voltage (~5 V) and ground integrity.
- Check MAF signal voltage at idle and while revving engine; look for stuck-high voltage or erratic spikes.
- Check for continuity or shorts between signal wire and battery 12 V with ignition off.
- Wiggle test harness/connectors while monitoring live data for intermittent changes.
Signal parameters
- Typical MAF signal voltage range: roughly 0.5–4.5 V (varies by sensor design).
- Idle signal often ~0.6–1.5 V; increases smoothly with throttle/RPM.
- Some MAFs report frequency or mass flow (g/s) instead of raw volts — expected trend: value rises smoothly with increased airflow.
- Reference voltage usually ~5 V (for sensor electronics) and a reliable ground are required.
- A persistent reading near battery voltage or a fixed high voltage is consistent with a P0103 condition.
Diagnostic algorithm
- Verify DTC and collect live data: confirm P0103 is current or historic and capture freeze-frame. Note related codes (fuel trims, IAT, MAP).
- Visual inspection: check air intake tubing, clamps, MAF mounting, and look for cracks, loose hoses, or obstructions. Inspect and unplug any aftermarket filter or intake components.
- Inspect connector and wiring: disconnect connector and inspect for bent pins, corrosion, pushed-out terminals, or contamination. Repair as needed.
- Measure voltages: backprobe signal, reference, and ground with ignition ON (engine OFF). Confirm reference ≈5 V, good ground, and that signal is not tied to battery voltage.
- Engine run test: with MAF connected, monitor signal while slowly revving engine. Look for a smooth rise; if signal is high or pegged, proceed.
- Check for short to 12 V: with ignition OFF, check continuity between signal wire and battery positive. If shorted, trace/repair harness.
- Clean and retest if contaminated: if MAF element is lightly contaminated, clean only with approved MAF cleaner and retest. Do not use other cleaners or touch element.
- Substitute test: if available, swap with known-good MAF sensor (same part) or test on bench per manufacturer procedure. Replace sensor if it remains high with wiring good.
- Verify PCM: if wiring and replacement sensor test OK but code returns, suspect PCM or module fault and consult manufacturer procedures before replacement.
- Clear codes and perform road test. Confirm code does not return and drivability/fuel trims are normal.
Likely causes
- MAF sensor contaminated or failed
- Signal wire shorted to 12 V or battery feed
- Dirty/oiled aftermarket air filter or intake contamination
- Loose, corroded, or damaged connector/ground
Fault status
Similar codes
Manual library for LAND ROVER
Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
LAND ROVER
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LAND ROVER: 2022
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Defender
- 90
- 90
- 90 S
- 90 S
- 90 V8
- 90 V8
- 90 V8 Carpathian Edition
- 90 V8 Carpathian Edition
- 90 X
- 90 X
- 90 X-Dynamic HSE
- 90 X-Dynamic HSE
- 90 X-Dynamic S
- 90 X-Dynamic S
- 90 X-Dynamic SE
- 90 X-Dynamic SE
- 110
- 110
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 V8
- 110 V8
- 110 V8 Carpathian Edition
- 110 V8 Carpathian Edition
- 110 X
- 110 X
- 110 X-Dynamic SE
- 110 X-Dynamic SE
- 110 XS Edition
- 110 XS Edition
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Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- 2022 Range Rover Base
- 2022 Range Rover Base
- First Edition
- First Edition
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SV
- SV
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
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Range Rover Evoque
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Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
-
-
LAND ROVER: 2021
-
Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography Fifty Edition
- Autobiography Fifty Edition
- 2021 Range Rover Base
- 2021 Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
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Range Rover Sport
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- HSE Dynamic
- HSE Dynamic
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HST
- HST
- SE
- SE
- SVR
- SVR
- SVR Carbon Edition
- SVR Carbon Edition
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Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
-
LAND ROVER: 2020
-
Defender
- 90 First Edition
- 90 First Edition
- 110 First Edition
- 110 First Edition
- 110 HSE
- 110 HSE
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 X
- 110 X
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
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Discovery
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- Landmark
- Landmark
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
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Range Rover
- Autobiography
- Autobiography
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
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Range Rover Evoque
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Range Rover Sport
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE Dynamic
- HSE Dynamic
- HSE PHEV
- HSE PHEV
- HST
- HST
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SVR
- SVR
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Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- SVAutobiography Dyn.
- SVAutobiography Dyn.
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P0103
AFS high input
Causes
- Short or short to battery on MAF signal wire
- Faulty MAF sensor (internal electronics failure)
- Contaminated or damaged sensing element (dirt, oil, silicone)
- Poor or corroded connector or ground
- Aftermarket intake/filter causing incorrect airflow or static charge
- PCM/ECM fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) on
- High fuel trims or overly rich condition (poor fuel economy)
- Rough idle, hesitation, stumbling or surging
- Reduced engine power or limp-home mode
- Hard starting or stalling in some cases
What to check
- Read and record freeze-frame and live data with a scan tool (MAF volts, frequency or g/s, fuel trims, RPM, throttle position, intake temp).
- Visual inspection of MAF sensor, connector, wiring harness, and intake for damage, contamination, or oil-soaked filter.
- Backprobe MAF signal and reference wires with key ON (engine OFF) to verify reference voltage (~5 V) and ground integrity.
- Check MAF signal voltage at idle and while revving engine; look for stuck-high voltage or erratic spikes.
- Check for continuity or shorts between signal wire and battery 12 V with ignition off.
- Wiggle test harness/connectors while monitoring live data for intermittent changes.
Signal parameters
- Typical MAF signal voltage range: roughly 0.5–4.5 V (varies by sensor design).
- Idle signal often ~0.6–1.5 V; increases smoothly with throttle/RPM.
- Some MAFs report frequency or mass flow (g/s) instead of raw volts — expected trend: value rises smoothly with increased airflow.
- Reference voltage usually ~5 V (for sensor electronics) and a reliable ground are required.
- A persistent reading near battery voltage or a fixed high voltage is consistent with a P0103 condition.
Diagnostic algorithm
- Verify DTC and collect live data: confirm P0103 is current or historic and capture freeze-frame. Note related codes (fuel trims, IAT, MAP).
- Visual inspection: check air intake tubing, clamps, MAF mounting, and look for cracks, loose hoses, or obstructions. Inspect and unplug any aftermarket filter or intake components.
- Inspect connector and wiring: disconnect connector and inspect for bent pins, corrosion, pushed-out terminals, or contamination. Repair as needed.
- Measure voltages: backprobe signal, reference, and ground with ignition ON (engine OFF). Confirm reference ≈5 V, good ground, and that signal is not tied to battery voltage.
- Engine run test: with MAF connected, monitor signal while slowly revving engine. Look for a smooth rise; if signal is high or pegged, proceed.
- Check for short to 12 V: with ignition OFF, check continuity between signal wire and battery positive. If shorted, trace/repair harness.
- Clean and retest if contaminated: if MAF element is lightly contaminated, clean only with approved MAF cleaner and retest. Do not use other cleaners or touch element.
- Substitute test: if available, swap with known-good MAF sensor (same part) or test on bench per manufacturer procedure. Replace sensor if it remains high with wiring good.
- Verify PCM: if wiring and replacement sensor test OK but code returns, suspect PCM or module fault and consult manufacturer procedures before replacement.
- Clear codes and perform road test. Confirm code does not return and drivability/fuel trims are normal.
Likely causes
- MAF sensor contaminated or failed
- Signal wire shorted to 12 V or battery feed
- Dirty/oiled aftermarket air filter or intake contamination
- Loose, corroded, or damaged connector/ground
Fault status
Similar codes
Manual library for MITSUBISHI
Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
MITSUBISHI
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MITSUBISHI: 2024
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Outlander
- Black Edition, AWD
- Black Edition, AWD
- Black Edition, FWD
- Black Edition, FWD
- ES, AWD
- ES, AWD
- ES, FWD
- ES, FWD
- Platinum Edition
- Platinum Edition
- SE, AWD
- SE, AWD
- SE, FWD
- SE, FWD
- SEL, AWD
- SEL, AWD
- SEL, FWD
- SEL, FWD
- SEL Black Edition, AWD
- SEL Black Edition, AWD
- SEL Black Edition, FWD
- SEL Black Edition, FWD
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Outlander PHEV
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MITSUBISHI: 2023
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Mirage
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Mirage G4
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Outlander
- 40th Anniversary
- 40th Anniversary
- Black Edition, AWD
- Black Edition, AWD
- Black Edition, FWD
- Black Edition, FWD
- ES, AWD
- ES, AWD
- ES, FWD
- ES, FWD
- Ralliart
- Ralliart
- SE, AWD
- SE, AWD
- SE, FWD
- SE, FWD
- SEL, AWD
- SEL, AWD
- SEL, FWD
- SEL, FWD
- SEL Black Edition, AWD
- SEL Black Edition, AWD
- SEL Black Edition, FWD
- SEL Black Edition, FWD
- SE Special Edition, AWD
- SE Special Edition, AWD
- SE Special Edition, FWD
- SE Special Edition, FWD
-
Outlander PHEV
-
MITSUBISHI: 2022
-
Eclipse Cross
- ES, AWD
- ES, AWD
- ES, FWD
- ES, FWD
- LE, AWD
- LE, AWD
- LE, FWD
- LE, FWD
- SE, AWD
- SE, AWD
- SE, FWD
- SE, FWD
- SEL, AWD
- SEL, AWD
- SEL, FWD
- SEL, FWD
- SEL Special Edition, AWD
- SEL Special Edition, AWD
- SEL Special Edition, FWD
- SEL Special Edition, FWD
- SE Special Edition, AWD
- SE Special Edition, AWD
- SE Special Edition, FWD
- SE Special Edition, FWD
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MITSUBISHI: 2021
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MITSUBISHI: 2020
