Code
P0164
Generic
P — Powertrain
O2 Sensor Circuit High Voltage Bank 2 Sensor 3
Views:
UK: 18
EN: 29
RU: 17
AI status
Completed
Completed
100%
Causes
- Faulty O2 sensor (Bank 2 Sensor 3)
- Signal wire shorted to battery/ignition voltage
- Poor ground or damaged connector/wiring
- Contaminated sensor (oil, coolant, silicone, fuel additives)
- Sustained rich fuel condition (high fuel pressure, leaking injector, stuck open injector)
- Catalytic converter saturation or internal damage allowing rich reading at downstream sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Possible poor fuel economy
- Rough idle or intermittent hesitation if underlying rich condition is severe
- Failed emissions test
- Usually no immediate drivability symptoms if only downstream sensor is affected
What to check
- Read and record freeze-frame and live data for Bank 2 Sensor 3 and upstream sensors (Bank2 Sensor1)
- Check for other related codes (fuel trim, injector, misfire, heater circuit codes)
- Visual inspection of Sensor 3 wiring and connector for corrosion, damage, melted insulation or pin corrosion
- Back-probe sensor signal wire with engine running and compare to Bank2 Sensor1 behavior
- Measure voltage on signal wire: consistent voltage >0.8 V indicates high output condition
- With key ON engine OFF check for battery voltage on the signal wire (indicates short to 12V)
Signal parameters
- Typical narrowband O2 switching range: ~0.1–0.9 V; persistent >0.8 V is considered high
- Downstream (post-cat) sensors normally show less switching and a lower amplitude if catalyst is working; persistent high voltage suggests rich exhaust or electrical fault
- Heater circuit: supplied by battery/ignition voltage via PCM or relay; expected resistance is low (a few ohms) — refer to OEM spec
- Trigger condition: PCM flags high-voltage when sensor output remains above the high threshold for a defined time or pattern
Diagnostic algorithm
- Verify code P0164 with a scan tool; record freeze-frame and any concurrent codes and clear code then perform a road/drive cycle to confirm reproducible fault
- Monitor live data: verify Bank2 Sensor3 voltage behavior and compare to Bank2 Sensor1 (upstream). If both read high, suspect fueling/cylinder or contamination. If only Sensor3 reads high, suspect sensor or wiring
- Inspect connector and wiring from Sensor3 to PCM; repair any physical damage and ensure good pin contact
- With ignition ON (engine off) check signal wire voltage. If near battery voltage, isolate and repair short to 12V. If open/grounded, find short to ground
- With engine running, backprobe and observe voltage. A steady >0.8 V while upstream sensor shows switching suggests downstream sensor fault or catalyst saturated
- Measure heater supply and heater resistance against OEM values; replace sensor if heater open or supply missing
- Check fuel system: fuel pressure and injector operation on Bank 2. High pressure or leaking injector(s) can produce rich exhaust and high O2 voltage
- Check for contamination: inspect sensor tip and exhaust for signs of oil, coolant, or silicone contamination; replace sensor if contaminated and address root cause
- If wiring and fuel system check good, replace the downstream O2 sensor (Bank2 Sensor3). Clear codes and retest drive cycle
- If fault returns after sensor replacement, perform deeper electrical diagnosis (pin-to-pin continuity to PCM, check PCM reference/ground) and evaluate catalytic converter efficiency
Likely causes
- Damaged or chafed signal wire shorted to 12V
- Failed downstream O2 sensor
- Oil or coolant contamination on sensor tip
- High fuel pressure or leaking injector on Bank 2
- Repair or aftermarket contamination (sealant, silicone) on exhaust near sensor
Fault status
Status
PCM detected a high voltage condition on oxygen sensor Bank 2 Sensor 3 (post-catalyst). The sensor output exceeds the high threshold or remains high long enough to set a fault. Possible causes include a failed sensor, wiring short to voltage, contamination, rich exhaust, or catalytic converter issues.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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Code
P0164
GWM
P — Powertrain
- High oxygen sensor circuit voltage (bank 2, sensor 3)
Views:
UK: 2
EN: 6
RU: 2
AI status
Completed
Completed
100%
Causes
- Faulty O2 sensor (Bank 2 Sensor 3)
- Signal wire shorted to battery/ignition voltage
- Poor ground or damaged connector/wiring
- Contaminated sensor (oil, coolant, silicone, fuel additives)
- Sustained rich fuel condition (high fuel pressure, leaking injector, stuck open injector)
- Catalytic converter saturation or internal damage allowing rich reading at downstream sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Possible poor fuel economy
- Rough idle or intermittent hesitation if underlying rich condition is severe
- Failed emissions test
- Usually no immediate drivability symptoms if only downstream sensor is affected
What to check
- Read and record freeze-frame and live data for Bank 2 Sensor 3 and upstream sensors (Bank2 Sensor1)
- Check for other related codes (fuel trim, injector, misfire, heater circuit codes)
- Visual inspection of Sensor 3 wiring and connector for corrosion, damage, melted insulation or pin corrosion
- Back-probe sensor signal wire with engine running and compare to Bank2 Sensor1 behavior
- Measure voltage on signal wire: consistent voltage >0.8 V indicates high output condition
- With key ON engine OFF check for battery voltage on the signal wire (indicates short to 12V)
Signal parameters
- Typical narrowband O2 switching range: ~0.1–0.9 V; persistent >0.8 V is considered high
- Downstream (post-cat) sensors normally show less switching and a lower amplitude if catalyst is working; persistent high voltage suggests rich exhaust or electrical fault
- Heater circuit: supplied by battery/ignition voltage via PCM or relay; expected resistance is low (a few ohms) — refer to OEM spec
- Trigger condition: PCM flags high-voltage when sensor output remains above the high threshold for a defined time or pattern
Diagnostic algorithm
- Verify code P0164 with a scan tool; record freeze-frame and any concurrent codes and clear code then perform a road/drive cycle to confirm reproducible fault
- Monitor live data: verify Bank2 Sensor3 voltage behavior and compare to Bank2 Sensor1 (upstream). If both read high, suspect fueling/cylinder or contamination. If only Sensor3 reads high, suspect sensor or wiring
- Inspect connector and wiring from Sensor3 to PCM; repair any physical damage and ensure good pin contact
- With ignition ON (engine off) check signal wire voltage. If near battery voltage, isolate and repair short to 12V. If open/grounded, find short to ground
- With engine running, backprobe and observe voltage. A steady >0.8 V while upstream sensor shows switching suggests downstream sensor fault or catalyst saturated
- Measure heater supply and heater resistance against OEM values; replace sensor if heater open or supply missing
- Check fuel system: fuel pressure and injector operation on Bank 2. High pressure or leaking injector(s) can produce rich exhaust and high O2 voltage
- Check for contamination: inspect sensor tip and exhaust for signs of oil, coolant, or silicone contamination; replace sensor if contaminated and address root cause
- If wiring and fuel system check good, replace the downstream O2 sensor (Bank2 Sensor3). Clear codes and retest drive cycle
- If fault returns after sensor replacement, perform deeper electrical diagnosis (pin-to-pin continuity to PCM, check PCM reference/ground) and evaluate catalytic converter efficiency
Likely causes
- Damaged or chafed signal wire shorted to 12V
- Failed downstream O2 sensor
- Oil or coolant contamination on sensor tip
- High fuel pressure or leaking injector on Bank 2
- Repair or aftermarket contamination (sealant, silicone) on exhaust near sensor
Fault status
Status
PCM detected a high voltage condition on oxygen sensor Bank 2 Sensor 3 (post-catalyst). The sensor output exceeds the high threshold or remains high long enough to set a fault. Possible causes include a failed sensor, wiring short to voltage, contamination, rich exhaust, or catalytic converter issues.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
Similar codes
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Code
P0164
HUMMER
P — Powertrain
Heated Oxygen Sensor (HO2S) Circuit Bank 2 Sensor 3 High Voltage
Views:
UK: 6
EN: 10
RU: 7
AI status
Completed
Completed
100%
Causes
- Faulty O2 sensor (Bank 2 Sensor 3)
- Signal wire shorted to battery/ignition voltage
- Poor ground or damaged connector/wiring
- Contaminated sensor (oil, coolant, silicone, fuel additives)
- Sustained rich fuel condition (high fuel pressure, leaking injector, stuck open injector)
- Catalytic converter saturation or internal damage allowing rich reading at downstream sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Possible poor fuel economy
- Rough idle or intermittent hesitation if underlying rich condition is severe
- Failed emissions test
- Usually no immediate drivability symptoms if only downstream sensor is affected
What to check
- Read and record freeze-frame and live data for Bank 2 Sensor 3 and upstream sensors (Bank2 Sensor1)
- Check for other related codes (fuel trim, injector, misfire, heater circuit codes)
- Visual inspection of Sensor 3 wiring and connector for corrosion, damage, melted insulation or pin corrosion
- Back-probe sensor signal wire with engine running and compare to Bank2 Sensor1 behavior
- Measure voltage on signal wire: consistent voltage >0.8 V indicates high output condition
- With key ON engine OFF check for battery voltage on the signal wire (indicates short to 12V)
Signal parameters
- Typical narrowband O2 switching range: ~0.1–0.9 V; persistent >0.8 V is considered high
- Downstream (post-cat) sensors normally show less switching and a lower amplitude if catalyst is working; persistent high voltage suggests rich exhaust or electrical fault
- Heater circuit: supplied by battery/ignition voltage via PCM or relay; expected resistance is low (a few ohms) — refer to OEM spec
- Trigger condition: PCM flags high-voltage when sensor output remains above the high threshold for a defined time or pattern
Diagnostic algorithm
- Verify code P0164 with a scan tool; record freeze-frame and any concurrent codes and clear code then perform a road/drive cycle to confirm reproducible fault
- Monitor live data: verify Bank2 Sensor3 voltage behavior and compare to Bank2 Sensor1 (upstream). If both read high, suspect fueling/cylinder or contamination. If only Sensor3 reads high, suspect sensor or wiring
- Inspect connector and wiring from Sensor3 to PCM; repair any physical damage and ensure good pin contact
- With ignition ON (engine off) check signal wire voltage. If near battery voltage, isolate and repair short to 12V. If open/grounded, find short to ground
- With engine running, backprobe and observe voltage. A steady >0.8 V while upstream sensor shows switching suggests downstream sensor fault or catalyst saturated
- Measure heater supply and heater resistance against OEM values; replace sensor if heater open or supply missing
- Check fuel system: fuel pressure and injector operation on Bank 2. High pressure or leaking injector(s) can produce rich exhaust and high O2 voltage
- Check for contamination: inspect sensor tip and exhaust for signs of oil, coolant, or silicone contamination; replace sensor if contaminated and address root cause
- If wiring and fuel system check good, replace the downstream O2 sensor (Bank2 Sensor3). Clear codes and retest drive cycle
- If fault returns after sensor replacement, perform deeper electrical diagnosis (pin-to-pin continuity to PCM, check PCM reference/ground) and evaluate catalytic converter efficiency
Likely causes
- Damaged or chafed signal wire shorted to 12V
- Failed downstream O2 sensor
- Oil or coolant contamination on sensor tip
- High fuel pressure or leaking injector on Bank 2
- Repair or aftermarket contamination (sealant, silicone) on exhaust near sensor
Fault status
Status
PCM detected a high voltage condition on oxygen sensor Bank 2 Sensor 3 (post-catalyst). The sensor output exceeds the high threshold or remains high long enough to set a fault. Possible causes include a failed sensor, wiring short to voltage, contamination, rich exhaust, or catalytic converter issues.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
Similar codes
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Code
P0164
LAND ROVER
P — Powertrain
Oxygen sensor - high voltage circuit. Bank 2 - sensor 3
Views:
UK: 2
EN: 6
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty O2 sensor (Bank 2 Sensor 3)
- Signal wire shorted to battery/ignition voltage
- Poor ground or damaged connector/wiring
- Contaminated sensor (oil, coolant, silicone, fuel additives)
- Sustained rich fuel condition (high fuel pressure, leaking injector, stuck open injector)
- Catalytic converter saturation or internal damage allowing rich reading at downstream sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Possible poor fuel economy
- Rough idle or intermittent hesitation if underlying rich condition is severe
- Failed emissions test
- Usually no immediate drivability symptoms if only downstream sensor is affected
What to check
- Read and record freeze-frame and live data for Bank 2 Sensor 3 and upstream sensors (Bank2 Sensor1)
- Check for other related codes (fuel trim, injector, misfire, heater circuit codes)
- Visual inspection of Sensor 3 wiring and connector for corrosion, damage, melted insulation or pin corrosion
- Back-probe sensor signal wire with engine running and compare to Bank2 Sensor1 behavior
- Measure voltage on signal wire: consistent voltage >0.8 V indicates high output condition
- With key ON engine OFF check for battery voltage on the signal wire (indicates short to 12V)
Signal parameters
- Typical narrowband O2 switching range: ~0.1–0.9 V; persistent >0.8 V is considered high
- Downstream (post-cat) sensors normally show less switching and a lower amplitude if catalyst is working; persistent high voltage suggests rich exhaust or electrical fault
- Heater circuit: supplied by battery/ignition voltage via PCM or relay; expected resistance is low (a few ohms) — refer to OEM spec
- Trigger condition: PCM flags high-voltage when sensor output remains above the high threshold for a defined time or pattern
Diagnostic algorithm
- Verify code P0164 with a scan tool; record freeze-frame and any concurrent codes and clear code then perform a road/drive cycle to confirm reproducible fault
- Monitor live data: verify Bank2 Sensor3 voltage behavior and compare to Bank2 Sensor1 (upstream). If both read high, suspect fueling/cylinder or contamination. If only Sensor3 reads high, suspect sensor or wiring
- Inspect connector and wiring from Sensor3 to PCM; repair any physical damage and ensure good pin contact
- With ignition ON (engine off) check signal wire voltage. If near battery voltage, isolate and repair short to 12V. If open/grounded, find short to ground
- With engine running, backprobe and observe voltage. A steady >0.8 V while upstream sensor shows switching suggests downstream sensor fault or catalyst saturated
- Measure heater supply and heater resistance against OEM values; replace sensor if heater open or supply missing
- Check fuel system: fuel pressure and injector operation on Bank 2. High pressure or leaking injector(s) can produce rich exhaust and high O2 voltage
- Check for contamination: inspect sensor tip and exhaust for signs of oil, coolant, or silicone contamination; replace sensor if contaminated and address root cause
- If wiring and fuel system check good, replace the downstream O2 sensor (Bank2 Sensor3). Clear codes and retest drive cycle
- If fault returns after sensor replacement, perform deeper electrical diagnosis (pin-to-pin continuity to PCM, check PCM reference/ground) and evaluate catalytic converter efficiency
Likely causes
- Damaged or chafed signal wire shorted to 12V
- Failed downstream O2 sensor
- Oil or coolant contamination on sensor tip
- High fuel pressure or leaking injector on Bank 2
- Repair or aftermarket contamination (sealant, silicone) on exhaust near sensor
Fault status
Status
PCM detected a high voltage condition on oxygen sensor Bank 2 Sensor 3 (post-catalyst). The sensor output exceeds the high threshold or remains high long enough to set a fault. Possible causes include a failed sensor, wiring short to voltage, contamination, rich exhaust, or catalytic converter issues.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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