Blazer Forum - Chevy Blazer Forums - P0135 Caused by Gutted CAT?

Blazer Forum - Chevy Blazer Forums (https://blazerforum.com/forum/)

- 2nd Generation S-series (1995-2005) Tech (https://blazerforum.com/forum/2nd-generation-s-series-1995-2005-tech-41/)

- - P0135 Caused by Gutted CAT? (https://blazerforum.com/forum/2nd-generation-s-series-1995-2005-tech-41/p0135-caused-gutted-cat-80453/)

ZachC540

Jul 15, 2013 09:56 PM

P0135 Caused by Gutted CAT?

Hey guys, I have a '99 2dr Blazer with both Cats gutted and I'm getting 2 codes. P0453 which I know is the Fuel Tank Pressure Sensor because its been on for over a year and I haven't got around to fixing it yet. The other is P0135 which I believe is the driver's side upstream O2 sensor. I gutted the Cats a few weeks ago and I was wondering if this could be causing the sensor to throw codes or should I just replace the sensor?

BMWDr

Jul 15, 2013 10:25 PM

That’s your O2 sensors heating element. To speed up your injection system working more efficiently the O2 sensors are electrically heated so the system can go into closed loop as quickly as possible. It’s monitored by the on board diagnostics and sets this code when it fails. Your o2 is still working but is on its way out. The cat will eventually set a P0420, TWC below efficiency.

ZachC540

Jul 17, 2013 12:50 PM

Thanks for the info man, I appreciate it.

All times are GMT -5. The time now is 04:32 AM.