Fabspeed Sport Headers CEL
#1
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My car is due for SMOG and in CA they check for flashes, so I flashed my ecu back to stock and went through the drive cycle to set readiness, but my car is now getting cat efficiency codes P0431 and P0421 for bank 1 and 2 post cat o2 sensors. I am curious if anyone has experienced headers with 200 cel HJS cats throwing CEL's.
I ordered some o2 sensor spacers to give that a try, but I was a bit disappointed as I paid the extra money so I wouldn't have to deal with this at SMOG check time.
I wonder if these HJS cats just wear out a lot faster than the OEM ones? For the record when I first had these headers they didn't throw a code, this was about 1 year and 9,000 miles earlier. I bought these second hand not sure how many miles the previous owner had.
Curious if anyone else has seen this?
I ordered some o2 sensor spacers to give that a try, but I was a bit disappointed as I paid the extra money so I wouldn't have to deal with this at SMOG check time.
I wonder if these HJS cats just wear out a lot faster than the OEM ones? For the record when I first had these headers they didn't throw a code, this was about 1 year and 9,000 miles earlier. I bought these second hand not sure how many miles the previous owner had.
Curious if anyone else has seen this?
#2
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I installed a full Fabspeed exhaust system on my 996, including those same cats. Threw CELs all the time. Fabspeed had assured me that there would be no CEL issues before I bought the parts. O2 sensor spacers didn't help.
Eventually I sold the car. Could never resolve the CEL issue, and Fabspeed was no help at all. In fact, Joe F. was downright nasty when I tried to discuss the issue with them. Not a fan of Fabspeed at all.
Eventually I sold the car. Could never resolve the CEL issue, and Fabspeed was no help at all. In fact, Joe F. was downright nasty when I tried to discuss the issue with them. Not a fan of Fabspeed at all.
Last edited by Cuda911; 01-31-2023 at 10:52 PM.
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Have you done a mechanical inspection? No leaks, sensor wires look ok?
Last edited by AdamSanta85; 02-01-2023 at 08:14 AM.
#7
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Many (not all) tuners will disable the codes if they know you have HFCs to avoid this issue.
I know of people who have been in this situation unknowingly.
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#8
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I have Soul Sport headers with 200 Cel cats and O2 Spacers, in spite of that I have had a couple of instances of P014A and P013E along with CEL.
They codes as well as the Check Engine light goes away on its own.
Thankfully no P0431 or P0421 but I did get those with Soul Catless Headers (With O2 Spacers) on my Cayman 987.1S and accepted them as part of the deal (catless headers)
They codes as well as the Check Engine light goes away on its own.
Thankfully no P0431 or P0421 but I did get those with Soul Catless Headers (With O2 Spacers) on my Cayman 987.1S and accepted them as part of the deal (catless headers)
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thesaintusa (02-01-2023)
#10
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strangely enough, this is pretty typical. As in different people having different results,
I purchased my Soul Sport headers preowned and the previous owner sold because he was having issues with CEL pretty frequently. I have been fine on the same set with the same set of O2 spacers.
Go figure
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AdamSanta85 (02-01-2023)
#11
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@Joec500 How long after resetting the CEL, does it take to come back? Are your sensors original? Think it could be a combo of worn sensors plus high-flow cats?
Last edited by AdamSanta85; 02-01-2023 at 11:59 AM.
#12
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https://rennlist.com/forums/991/1256...spacers-3.html
Seems like the J style O2 spacers worked for these guys
Seems like the J style O2 spacers worked for these guys
#13
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https://rennlist.com/forums/991/1256...spacers-3.html
Seems like the J style O2 spacers worked for these guys
Seems like the J style O2 spacers worked for these guys
#14
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Yup this was me! I noticed after flashing to the tune, the catalyst monitoring was set automatically with zero drive cycles which is impossible without a tune modification.
#15
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https://rennlist.com/forums/991/1256...spacers-3.html
Seems like the J style O2 spacers worked for these guys
Seems like the J style O2 spacers worked for these guys
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AdamSanta85 (02-01-2023)