Low severity
P0031Low resistance in the lambda sensor heater (Bank 1, Sensor 1)
Part
Lambda sensor
Part price
$75
At a workshop
$100
You save
$25
How to read code P0031
P
System
Powertrain (engine and transmission)
0
Code type
Generic code (SAE / OBD-II)
0
Subsystem
General system / auxiliary measurement
31
Fault number
Specific fault within the subsystem
Symptoms
- Check engine light on the dash
- Sensor takes longer to reach operating temperature
- Emission errors on cold start
Possible causes
- Short in the sensor heater circuit
- Faulty lambda sensor
- Mass air flow sensor issue
Diagnostic steps
- 1Use a multimeter to check the heater resistance
- 2Inspect the wiring for shorts to ground
- 3Check the sensor connector for damage
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Frequently asked questions about P0031
What does code P0031 mean?
P0031: Low resistance in the lambda sensor heater (Bank 1, Sensor 1).
What are the symptoms of code P0031?
Check engine light on the dash; Sensor takes longer to reach operating temperature; Emission errors on cold start.
What causes code P0031?
Short in the sensor heater circuit; Faulty lambda sensor; Mass air flow sensor issue.
Can I drive with code P0031?
SAFE TO DRIVE – The fault does not immobilise the car, but diagnose it as soon as possible.
How much does it cost to fix code P0031?
The part (Lambda sensor) costs about $75, and a mechanic’s labour about $25.
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