Diagnostic Trouble Code
P0159
O2 Sensor Circuit Slow Response B2S2
Technical Description P0159
Oxygen Sensor Circuit Slow Response (Bank2, Sensor2)
What Does This Mean P0159?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.
This involves the rear oxygen sensor on the passenger side. Bank 2 is the side of the engine that does not contain cylinder #1. Sensor #2 is the second sensor downstream from the engine.
This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use.
This involves the rear oxygen sensor on the passenger side. Bank 2 is the side of the engine that does not contain cylinder #1. Sensor #2 is the second sensor downstream from the engine.
This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use.
Possible Causes P0159
1
The oxygen sensor is faulty
2
The wiring to the sensor is broken / frayed
3
There is an exhaust leak
Solutions & Repair Steps P0159
The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is more than likely the rear passenger side oxygen sensor. You will likely wind up replacing it but you should also consider these possible solutions:
If the code comes back, the problem is more than likely the rear passenger side oxygen sensor. You will likely wind up replacing it but you should also consider these possible solutions: