So about a week ago I got a CEL, and all of a sudden i was getting poor acceleration, and the car would stop pulling under WOT at about 4000rpm. Well the codes pulled are as follows

P0130 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)


I replaced the front o2 sensor, and am about to replace the rear. But I have a feeling this will not fix the problem. As there are 3 more codes. Help is great appreciated

 

Replace the Rear one. Check really really good for vaccum leaks and make sure you have none.

The Front one will throw codes for the rear one. And the rear one will throw codes for the front one.

 

Ok i ordered the rear o2 sensor today.. one question though. What about the Heater Circuit and Low Voltage Malfunction.. will this malfunction go away when the rear o2 sensor is replaced?

 

That is part of the o2 sensors.They are heated O2 sensors.

 

Ok so i replaced the rear o2 sensor this morning, and to my dismay still have horrible acceleration. Car will not pull past 4k rpms. I'm getting 2 codes now

P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)


Does Sensor 2 have to do with the rear o2 sensor?

 

Yes I believe that means the Rear o2 sensor.
Im not 100% sure I don't use the P codes.