Answer: Kristopher, as you know, lean oxygen sensor and fuel trim codes can be some of the hardest fault codes to diagnose.

Answer: Even though the code is for an O2 (oxygen) sensor, it is pretty obvious the problem isn’t with the sensor itself. There are three possible types of faults which can cause oxygen-sensor ...

When Should I Replace The O2 Sensor? The answer to this question is complex, as these sensors are not your standard maintenance items. No indicator lights on your dashboard or other means could hint ...

I had a test done at local auto-parts store that showed a code of PO138. They told me this indicates a problem with the oxygen sensor. I replaced the oxygen sensor and the light never went out. I ...

Mitsubishi wants you to know that you need to be extra careful when troubleshooting knock sensor faults on 2007-08 Outlander SUVs. The problem has to do with the fact the knock sensor circuits were ...

Mike, this is not an uncommon problem, fault code 36 is for the burn-off function of the mass airflow sensor.

A lazy front oxygen sensor is operating fast enough not to set an oxygen sensor code, but not fast enough to see the EGR valve is opening and closing as it should.