P0146 Code - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 3

What Does P0146 Mean?

The poor running symptoms are consistent with a MAP sensor malfunction. In addition, in some cases, a bad MAP sensor will not throw a code. Again, the ELD code likely represents a separate wiring issue. When you see P0146 engine fault code on your engine code reader this description will help you.

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What are the common causes of P0146 ?

• Damage to wiring in the heater control circuit that could influence the time it takes a sensor to reach working temperature – about 6000C.
• Damage to the signal circuit wiring and/or connectors.
• Blown fuse(s) in the heater control circuit (where applicable) that prevents the element from heating up. In these cases, there is likely to be a “low input voltage” related code present as well.
• Defective oxygen sensor.
• Failed, or failing PCM. Note that this is a rare event, and the fault must be sought elsewhere before any controller is replaced.

What are the symptoms of P0146 ?

Symptoms of a P0146 DTC may include:

• MIL (Malfunction Indicator Lamp) on
• May idle or drive poorly
• Fuel economy may decrease

How do you troubleshoot P0146 ?

• Replacing the O2 sensor for bank 1 sensor 3 after all other checks of the fuel and exhaust systems test okay, including repairing any oil or coolant leaking onto the sensor
• Testing the fuel system and replacing a leaking injector or fuel regulator
• Cleaning the injectors to see if the leaks stop before replacing them

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