Hey everyone. I have searched and haven't really found an answer. I have a custom turbo kit with a custom 2.5" downpipe. I keep getting the P0133 CEL code. I know it means upstream O2. But what should i do to fix it? Is it the sensor? When i clear the code it wont turn back on for a week or weeks. Where should i start to diagnose this?

Do you have an upper o2 sensor? If not then thats probably it and if so then get it.

eX-Drivers


"Eclipse tuners are a strange sort. They don't like talking about wings or color-matching side skirts and interiors. Eclipse tuners are performance-obsessed sleeper fanatics who dream only about downpipes, exhuast gases, and wastegates. Their cars aren't pretty, but have the ability to spank you silly on the highway. In other words, Eclipse tuners write checks their cars can cash. Mention the word "chrome" and they might drop a boot to your skull" -SuperStreet

My Wiki page- http://www.2gnt.com/index.php?d=99Blackclipse

Yes, I have both the original O2 sensors in their original locations.

Sounds like your FO2S is shot or on it's way out. Might as well hit up oxygensensor.com or whatever it's called.

Thats what I was thinking as well...I can't remember that damn URL.