Low severity
P0042Additional Heater Circuit Fault for the Bank 1 Oxygen Sensor
Part
Oxygen sensor
Part price
$75
At a workshop
$100
You save
$25
How to read code P0042
P
System
Powertrain (engine and transmission)
0
Code type
Generic code (SAE / OBD-II)
0
Subsystem
General system / auxiliary measurement
42
Fault number
Specific fault within the subsystem
Symptoms
- Check Engine light on the dashboard
- Longer than normal heating time for the oxygen sensor after starting
Possible causes
- Burned-out heating element in the oxygen sensor
- Break in the power supply circuit for the heating element
- Corroded pins in the connector
Diagnostic steps
- 1Measure the resistance of the heating element with a multimeter directly on the sensor
- 2Check for 12V power at the connector after turning the ignition on
- 3Inspect wiring for signs of wear
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Frequently asked questions about P0042
What does code P0042 mean?
P0042: Additional Heater Circuit Fault for the Bank 1 Oxygen Sensor.
What are the symptoms of code P0042?
Check Engine light on the dashboard; Longer than normal heating time for the oxygen sensor after starting.
What causes code P0042?
Burned-out heating element in the oxygen sensor; Break in the power supply circuit for the heating element; Corroded pins in the connector.
Can I drive with code P0042?
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 P0042?
The part (Oxygen sensor) costs about $75, and a mechanic’s labour about $25.
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