I have p0134 and p1164 that often come up. I’m able to clear them but with them clear the car sometimes will hesitate under a bit of load. When the code returns the car functions fine but the check engine lights up.

i have tried changing the O2 AF sensor with a new one, but the same issue remained. So, I thought it was a faulty sensor and bought a second one with the same results.

The other day I did a read and the code p0137 also was present.

 

Do you have any exhaust leaks before the primary o2 sensor?

 

Never noticed any leaks before the sensors but I’ll have a look. I was thinking the pipe that the O2 and AF sensors screw into may have a build up of Carbon and giving a bad read. However, the code is that the heater element part of the sensor isn’t working.