Code
P0075
LAND ROVER
P — Powertrain
(bank 1)
Views:
UK: 11
EN: 36
RU: 24
AI status
Completed
Completed
100%
Causes
- Open or disconnected sensor wiring/connector
- Short to battery voltage on the sensor signal wire
- Failed intake air temperature (IAT) or ambient air temperature sensor
- Corroded or bent connector pins or water ingress
- Faulty engine control module (rare)
- Aftermarket component or recent service damage to harness
Symptoms
- Illuminated MIL / check engine light
- Possible poor cold-start behavior or drivability issues (depending on strategy)
- Incorrect intake air temperature reading on scan tool (very high or stuck)
- Reduced fuel economy or hesitation in some cases
- Codes may be intermittent or persistent
What to check
- Read freeze frame and live data with a scan tool — note the reported air temp and when the fault sets
- Visually inspect sensor, connector, and wiring on bank 1 for damage, corrosion, or disconnected plugs
- Wiggle test harness while monitoring live data to see if signal changes
- Measure voltage at the sensor connector with key on (expected signal range usually ~0.5–4.5 V; high means near battery voltage)
- Check resistance of the sensor (with sensor removed) and compare to manufacturer spec or known thermistor chart
- Check for short to battery: measure continuity between signal wire and battery positive with ignition off
Signal parameters
- Sensor type typically a thermistor (NTC) — resistance changes with temperature
- Expected signal voltage range (typical) ~0.5–4.5 V; 'High' faults are near battery voltage or out-of-range
- Resistance vs temperature is manufacturer-specific; low resistance at high temp, higher resistance at low temp for NTC
- Signal update rate: continuous/periodic with engine/ignition on; compare to live data
Diagnostic algorithm
- Connect a scan tool; record freeze frame and live intake/ambient air temperature values and monitor while key on and cranking.
- Visually inspect the sensor (location varies — intake tract or MAF housing) and harness on bank 1 for obvious damage, oil/water contamination, or disconnected plugs.
- With ignition off, disconnect the sensor connector and inspect pins for corrosion, bent pins, or pushed-out terminals.
- Measure sensor resistance at the sensor terminals and compare to the manufacturer's resistance/temperature chart. Replace sensor if out of spec.
- With connector attached and key on, backprobe the signal terminal and measure voltage. A voltage near battery voltage suggests an open or pull-up; ~0 V suggests short to ground. Compare to expected range (~0.5–4.5V).
- Check continuity between the sensor signal terminal and the PCM connector to rule out wiring breaks. Check for short to +12V and short to ground.
- Repair any damaged wiring or connector issues (replace pins, harness, or sensor as needed).
- Clear codes and perform a test drive or reproduce the conditions to confirm the fault does not return.
- If wiring and sensor check good but code persists, consider PCM input circuit fault — consult Land Rover diagnostics and consider module testing/replacement.
Likely causes
- Damaged/frayed wiring or broken pin at sensor connector
- Sensor has failed (internal short or opens at normal temps)
- Connector corrosion or poor terminal contact allowing high voltage reading
- Pinched wire causing intermittent short to 12V
- PCM internal input circuit fault (least common)
Fault status
Status
P0075 — Intake/ambient air temperature sensor circuit high input (Bank 1). Check sensor, wiring, and connectors for open or short to voltage. Clear code after repair and verify.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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