P0150 Code - O2 Sensor Circuit Malfunction Bank 2 Sensor 1

What Does P0149 Mean?

An oxygen sensor for a one particular engine bank has delivered a voltage signal that is not within the accepted parameters, causing the PCM to store a trouble code and possibly illuminate the service engine soon light. Bank 2 typically denotes the engine bank of the engine block that does not contain the number 1 cylinder. S1 tells you that the fault is found in sensor 1, or the upstream sensor (ahead of the catalytic converter/s).

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What are the common causes of P0149 ?

• The ECM monitors the O2 sensor’s highest and lowest voltages. In the case of the P0150 code, the voltages coming from the O2 sensor are not within specifications.
• The ECM detects a voltage problem and turns on the Check Engine Light.
• Exhaust leaks in front of the sensor cause an erratic reading from the sensor.

What are the symptoms of P0149 ?

• The engine may run excessively rich if the engine goes into an open loop.
• The engine may start to misfire if the spark plugs get fouled out over time.
• The Check Engine Light will be illuminated.
• You may have exhaust leaks at the manifold or the connection at the header pipe.

How do you troubleshoot P0149 ?

While fuel economy was increased, acceleration was seriously compromised, and the loss of engine vacuum led to a dangerous loss of braking assist when the P0150 code system was in four-cylinder mode. In addition to these issues, while the company proposed a hydraulically controlled system that could be switched from within the car, the version they implemented had to be manually changed in the engine compartment using hand tools.



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