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Engine-Codes.com | All About OBDII Engine Codes


P0142 - O2 Sensor Circuit Malfunction Bank 1 Sensor 3

P0142 Comments |  Add Comment
Possible causes
- Faulty Heated Oxygen Sensor Bank 1 Sensor 3
- Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted
- Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection
Help with Possible causes What does this mean?
Tech notes
Replacing the O2 Sensor 3 usually takes care of the problem
Help with Tech Notes What does this mean?
When is the code detected?
Current amperage in the rear heated oxygen sensor heater circuit is out of the normal range.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
P0142 Description

The rear heated oxygen sensor (or sensor 3 for some vehicles), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Even if switching characteristics of the heated oxygen sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 3.

This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 3 is not used for engine control operation.

P0142 Information for specific makes
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