Newbie here. I Have a 2006 Carrera 4S with 3.8L V6. I keep getting the following 02 sensor codes;
1) P0660- Intake manifold switchover driver no signal
2) P0135- 02 sensor heater circuit malfunction, bank 1 sensor 1
3) P2A00- 02 sensor circuit range/ performance, bank 1 sensor 1
4) P0154- 02 sensor circuit no activity detected, bank 2 sensor 1
5) P0134- 02 sensor circuit no activity detected, bank 1 sensor 1
6) P0153- 02 sensor circuit slow response, bank 2 sensor 1
7) P2197- 02 sensor signal biased/ stuck lean, bank 2 sensor 1
8) P0133- 02 sensor circuit slow response, bank 1 sensor 1

In short, it appears that i'm not getting signal on the two pre-cat sensors. I barely got those two replaced yesterday (with OEM Lambda sensors), same codes still appear.

Please let me know what i'm missing here.

Thanks
-PK

 

Did you change something on the car? Does it have 200 cell cats or some other exhaust mods? A tune of some sort? Give us a little more information.

 

Not at ll. Car is 100% stock with sport exhaust. Nothing has been modified.

 

I've done a little bit more research and it appears that I might have a couple of broken wires somewhere behind the plenum. How do I access this area?

 

Remove ...
Air filter box
Air hoses going to the plenum
Plenum and hoses attached to it