I recently got:
P0141 (post cat O2 sensor heater control circuit malfunction)
P0130 (pre cat O2 sensor circuit malfunction)
And the car was doing about 12l/100km.
I replaced the pre cat O2 sensor and the fuel economy is back on track. I due however still get a P0141 error after driving for a while.
Now the obvious solution is to also replace the post cat O2 sensor. However, it is rusted completely into the exhaust and I doubt i can get it off without ruining the exhaust. I also find it very unlikely that the two O2 sensors should fail simultaneously. Could the problem be something else or does someone have an idea on how to remove the rusted sensor? I am currently running the car without the exhaust heat shield (since it is rusted into oblivion) - could this cause the "heater control circuit malfunction"?
I've attached the Pre and Post cat sensor readings.
P0141 (post cat O2 sensor heater control circuit malfunction)
P0130 (pre cat O2 sensor circuit malfunction)
And the car was doing about 12l/100km.
I replaced the pre cat O2 sensor and the fuel economy is back on track. I due however still get a P0141 error after driving for a while.
Now the obvious solution is to also replace the post cat O2 sensor. However, it is rusted completely into the exhaust and I doubt i can get it off without ruining the exhaust. I also find it very unlikely that the two O2 sensors should fail simultaneously. Could the problem be something else or does someone have an idea on how to remove the rusted sensor? I am currently running the car without the exhaust heat shield (since it is rusted into oblivion) - could this cause the "heater control circuit malfunction"?
I've attached the Pre and Post cat sensor readings.