O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
The engine computer is not getting a correct signal from the oxygen sensor after the catalytic converter on bank 1. This can be caused by a bad sensor, wiring damage, or a connector problem.
You can usually drive short distances, but the issue should be diagnosed soon. Fuel economy may drop and the vehicle may fail an emissions test.
P0136 means the powertrain control module has detected a malfunction in the oxygen sensor circuit for Bank 1 Sensor 2, the downstream sensor located after the catalytic converter on the engine side with cylinder 1. The fault may be electrical, including an open circuit, short circuit, damaged connector, failed heater circuit, or an aging oxygen sensor with slow or incorrect response.
It is the oxygen sensor located after the catalytic converter on the side of the engine with cylinder 1.
Yes. A heater circuit problem can prevent the sensor from working correctly and trigger this code.
Often it will not cause severe drivability problems, but it can affect fuel economy and emissions.
Usually no. The most common causes are the sensor itself or wiring issues, not the catalytic converter.