Ok, i have emissions due in literally 5 days. Heres my problem: i have a CEL. I thought it was because of the RRM Header so i changed back to my stock header. I went to autozone to have them see why my CEL was on. They told pulled these codes: 132, 134, & 135. They said it was an o2 problem.

Now, my question is, if i change out the o2 sensor will this make my CEL go away? I know its the o2 in my header and not the one on the back cat. Also, how long does it usually take for the CEL to go off (25 miles, 50 miles)? And lastly just to be safe how exactly do i change the 1st o2? I have the o2 socket. Will i need to disconnect the battery?

Thank you so much for taking the time to read this!

 

Did you disconnect the battery and let the ecu reset? You might want to try that.

 

You might get an ECU not ready read. And emissions will tell you to come back later.

 

Where are you located at in the Chicago suburbs? I can clear the codes for you using ScanTech. You can then drive your car around and let the ECU re-adjust for the stock header being back on. I'm guessing that your CEL came on because the readings it was getting from the O2 are drastically different all of a sudden that your stock header is back on. If clearing the code doesn't keep it off, your next best step is to reset your ECU and let it learn the engine again. The downside to this is that you will need to drive your car as much as possible for the ECU to have all the readiness monitors ok.

 

When you go get you take your emissions test your CEL will come back no matter what and they will give it a diagnostic test and they will know it won't pass either way. Only way to do it is get it at a inspection place that will do it for more money or get it fixed than take it there.

 

Ok...

What you said makes little to no sense. I don't know what you meant by, "your CEL will come back no matter what." If his car isn't throwing a CEL and all the readiness monitors in the ECU are clear then he will pass. It's as simple as that. And there's no point in replacing the O2 sensor for no reason since he doesn't know if his current one is even bad.

 

I'm sorry...i'm just saying that if your CEL is on and you goto autozone to turn it off and try to go get it inspected it will not work. And The ecu runs the engine i mean wouldn't the problem come back unless he got it fixed?...And as he stated there could be 2 things wrong. bad cat in exhaust manifold or bad o2 sensor. I'm sorry if i don't make any sense.

 

And...i don't see why his CEL would come on when his o2 is connected to his header from RRM and they state all their headers come with CEL eliminator.

 

He hasn't established if he even has a problem to where he needs to replace parts. If you have a code being tripped for an O2 sensor, replacing the O2 sensor isn't always the fix. What he should do is either reset the code or disconnect his battery to reset the ECU and drive his car around to see if the code comes back on. If the code comes back on after he has reset his ECU then he has a bad O2. If the light doesn't come back on after all of the monitors in the ECU have reset then it was just bad fuel trims or a tricked slow responding O2 code caused by the RRM header. Just because you trip a code it doesn't automatically mean that a part is bad.

 

exactly...it could be something else and if you get your car scanned they should have a code book that tells you what the code is and where its at. And if you have read more carefully he even said they said it was a o2 problem..???

They told pulled these codes: 132, 134, & 135. They said it was an o2 problem.

I mean i'm sorry when you say i don't make any sense just sound likes you are assuming im ignorant. Clearing the ECU doesn't make it dissappear to pass emissions. Go get your emissions checked and if you don't pass you have 30 days to fix your problem.

 

If there is nothing wrong with the O2 sensor then clearing the ECU and driving the car for it to learn the adjustments will reveal this. If the light comes back on then yes there is an issue with the O2 sensor. If the light does not come back on then you've just proved that the CEL was from bad fuel trims (seems pretty rational considering he had a RRM header).

If you get a bad tank of gas and don't realize it, your engine gets a slight knock and the CEL comes on with a knock sensor code, it doesn't mean that you automatically have a bad knock sensor.

I never made any statement about clearing the code and then going to emissions to magically pass. I made the point that he could either clear the code and drive for a bit to see if the code returns or that he could disconnect his battery to reset the ECU and drive for a bit to see if the code returns.

I've made my points and I'm done.

 

I'm sorry i don't come on here to try and argue with people. just trying to help. And i never read your statements saying they didn't make any sense or to try to knock you for helping someone. We are just here trying to do what we can to the best of our knowledge. Now if you didn't want me to lets say "try" since none of my information is worth it...than just say so.

 

Thanks for all your help! What I did was reset my ECU by disconnecting the battery. I drove it around until the SES came back. Then i bought a new o2 and replaced the bad sensor. I drove the car for about 60 mi. until the SES went off. I passed emissions. Thank you everybody who helped me out.