Welcome to 2CarPros.
The codes are identified as the following:
P0138 - Rear heated oxygen sensor bank 1
P0139 - Rear heated oxygen sensor bank 2
P0325 - Knock sensor
P0400 - EGR (exhaust gas re-circulation)
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Can you explain what the vehicle is doing? Also, the o2 sensors can be off due to either the EGR or the knock sensor. I don't see how the EGR and knock sensor are related. The EGR valve could be bad or even have a vacuum leak or carbon build up. The knock sensor, on the other hand, is either bad or has a bad connection. It is located under the intake manifold and not a 5 minute job.
Let me know what you are experiencing so I can better diagnose.
Take care,
Joe
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Wednesday, July 31st, 2019 AT 7:48 PM
