I didn't think this would happen, but it did. I was driving home on Saturday night from dinner after a cruise in with a few friends, and the dredded CEL came on. I plugged in the X-Cal, and read it, P0133, a slow responding 02 sensor. Had my techs look at it, and they say their is too much fuel going to it, and its reading "too rich". Most likely the tune, I would think. Would a small adjustment in the tune fix this problem? Any help would be appreciated. I really don't want to have to get rid of my headers, but if this is the start of things, I don't know! PA is too tough of a state to mess with for inspection (every year emissons). Thanks for the help.

 

I'm sure those hi-flow cats are letting the rear O2 sensors read a rich condition. If you can't fix it w/ the tune, or don't want to turn them off (which leads to emissions testing problems), then I'd try MIL eliminators. I have a set for my AR LT header and catted H. I'm still installing them, so I can't say for certain how well they work, but that is what they are designed for.

 

This actually has nothing to do with running rich. It's how the o2s take longer to warm up with their new position on the long tube headers. It can be cleared by resetting the ECU and will only show up time to time. It's not a problem.

As for the way to get rid of it, when you come down here for the retune with the new intake, we'll knock the problem out for you!

Here is a good post on it:

"P0133 02 sensor circuit slow response code is a common code when having longtube headers. Bank1 sensor1 is the passenger side front 02 sensor. Remember when using longtube headers your front 02 sensors are further downstream, which takes them a little longer to heat up and start responding properly. It doesn't mean the o2 sensors are bad, they just need to warm up a little longer. So when you start your car up don't just put it in gear and take right off, let the rpm's come down slowly on there own. You may still get the code from time to time but this should help some. "

Although, the guy was wrong because they are heated wires now, so the o2 sensor is just responding slowly in it's new position. That's the issue.... we can solve it with SCT's software.

CR
Tillman Speed

 

Ah, so it/s the front O2 sensors. good to know.
So CR, will that tune you are sending me have this adjusted already??

 

Thanks CR. I got your PM. Looking forward to your call.

 

Great Jeff!

Jim, Yes it will be turned off for yours as well.

It's an issue in the open loop section that can be hammered out, as well as the o2 transport delay. I've already got it done for Jeff's tune, and I'm doing it for yours right now, Jim!

It's how quickly the o2 sensor reacts to changes in fuel, etc. The numbers have to be made slightly higher for the adjusted length in delay from being farther downstream.

THANKS FELLAS

CR

 

Whoa....CR, your are leaving my rear O2 sensors ON right?! That's what I bought the MIL eliminators for. You know so I could get thru emissions testing. You can adjust for the transport delay or whatever, but I need those rear heaters/sensors "active" for the OBD scan.

 

Jeff.. glad its not a big problem.. got your PM.. glad at yeast are are ok with the experience at Pauls... I am not.. I put a thread up about and now am trying to resive the scans of the dyno graphs. CR... I'm still waiting for that call. Thanks bro.

 

Yes sir... your rear o2's are going to be on, for emissions purposes. The front o2's are the ones causing the issues here. I have a fix for it with the open loop fuel and transport delay tables. You're taken care of! The tune will be to you in a half hour or so.

CR
Tillman Speed
610-497-3711

 

CR any way you can email me the fixed tune for my Airaid. Even though I'm only going to have it on for a little longer, I'd love to have the CEL turned off the car while I'm driving it to a show Sunday. Thanks in advance. And BTW, is the 31st good to come down to the shop for the new C&L tune?

 

That works great, Jeff! And I'll send over that tune ASAP!

CR
Tillman Speed
610-497-3711

 

The wires are heated??? Meaning what exactly? They provide some type of heat to the sensor??? Does this mean that if you put on an OR pipe and the wiring for the front 02 sensor was short, that I shouln't have spliced/extended it??? Please advise asap! I hope I'm just taking you too literally and haven't created some kind of hazard.

 

Although much more infrequent these days, I did have my CEL come on this morning. Turns out I had two codes, for the same problem P0153 and P0133 (i.e. both front O2 sensors). Whatever, I cleared them, and I'll carry on.

 

Well, for a different reason you shouldn't splice 02 wires. You CAN do it but oftent times it will cause issues. Those wires are very sensitive to splicing since it's possible to change the resistance of that setup with a splice. It's best to use extenders.

 

Same with me bud. I've had the light come on periodically (usually when its cold and I don't let the car warm up for a few minutes 1st). I do the same, get the X-Cal out, clear the code and drive on.

 

I just installed long tubes as well, and I am getting p0141, and p0161 also p2270 and p2272

looks like all of these have to do with sensor 2 on both banks which should be turned off in the bamachips 93 race tune that doug sent me with the update for the headers.

I have tried looking in the predator and turning off the catalyst switch, and got the error again, so i turned catalyst back and on turned exhaust to off. still getting the error.

I also disconnected the battery and the errors came back.

can't seem to get a hold of doug atm.

those 2270 and 2272 errors are o2 sensor signal stuck lean. you think it is ok to drive with this going on? i figure if the o2 sensor is stuck lean the worst that could happen is the computer would compensate by richening the mixture which wont hurt anything but my power and my mpg right?

 

Just got off the phone with diablosport and they say to set all obd options to off in the predator to get rid of the O2 sensor errors. since the manual on their web site does not match the device menu i figured I wuold post this useful tidbit...

set catalyst to off
set exhaust temp to off
and set hego to off is what they said.

Just FYI.

great....now I replying to my own posts....I think that might be worse than talking to yourself..