P0155 & P0135 codes

**fna7302** · 04-09-2015, 07:20 PM

I have a 2002 T/A with an LS6 engine and keep getting P0135 & P0155 codes...car is running in closed loop most of the time. Wiring has been tested and is OK. Coolant system is working normally. All sensor have been replaced and are new. Car has ARH long tube headers. Freeze frame data shows normal fuel trims and normal o2 sensor operation. The exhaust has multiple pin hole leaks downstream starting about 2' after the bank 2 sensors. The leaks are from band clamp style clamps.

Does anyone have any advice/insight on what may be causing this and how I can fix it? Thanks in advance for any information you can lend.

**0rion** · 04-09-2015, 07:53 PM

what sensors are you running? Those are heater codes and are pretty common with longtubes. Not everyone gets them but quite a few do. I switched to bosch 13111 sensor some years ago and haven't had a heater code since. I believe firebirdjones also had the same luck when switching to 13111 sensors. That's actually the part number for rear sensors on the vettes. They have a longer harness and *supposedly* have a better heater in them. Not sure how much I believe the heater stuff but I will say I haven't had a heater code since switching and that's been at least 5 years ago....probably more.

**theorangeguy** · 04-09-2015, 07:55 PM

Originally Posted by 0rion

what sensors are you running? Those are heater codes and are pretty common with longtubes. Not everyone gets them but quite a few do. I switched to bosch 13111 sensor some years ago and haven't had a heater code since. I believe firebirdjones also had the same luck when switching to 13111 sensors. That's actually the part number for rear sensors on the vettes. They have a longer harness and *supposedly* have a better heater in them. Not sure how much I believe the heater stuff but I will say I haven't had a heater code since switching and that's been at least 5 years ago....probably more.

I switched to the C5 corvette sensors about a week after I bought my car as well. Highly recommend them.

**fna7302** · 04-09-2015, 08:07 PM

Great question and not sure as they were just changed recently...I'll check with my friend who is trying to diagnose this problem and will get back to you via this thread-thanks so much for the prompt response