Tuning and CELs

Baperrin

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Hi everyone,

Please excuse me if this is a redundant or otherwise dumb post. I've never tuned or modded the drivetrain on a vehicle before. I'm very interested in getting a downpipe, CAI, catback exhaust, and tune on my Supra when it arrives, but I also don't want the dash to look like a Christmas tree. Seems like I've noticed a lot of people on the forums having trouble with their mods and tunes throwing CELs regularly. Is this just the price you pay to play?

Thanks
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Mysta

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You can turn it off with the ecu controller, main source of CEL is just the second o2 in the downpipe not seeing a reading it wants from the cat section.
 
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Baperrin

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Is this also true for catted downpipes?
 

Tsar

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- There isn't gonna be a CEL from a cat-back exhaust.
- Haven't heard of one from a CAI either.
- Catless downpipes will throw a CEL obviously, but could be tuned out.
- Some catted downpipes do not throw a CEL (AA has no CEL guarantee, as an example). All depends on the what cat they use.
- Whether you will get a CEL from a "tune" will probably depend on what kind of "tune" it is (and from who), and what other mods you have.
 

Twisted Tuning

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- There isn't gonna be a CEL from a cat-back exhaust.
- Haven't heard of one from a CAI either.
- Catless downpipes will throw a CEL obviously, but could be tuned out.
- Some catted downpipes do not throw a CEL (AA has no CEL guarantee, as an example). All depends on the what cat they use.
- Whether you will get a CEL from a "tune" will probably depend on what kind of "tune" it is (and from who), and what other mods you have.
^this
 
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Baperrin

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Gotcha. I think I would be looking at hopefully doing a catted downpipe, cat-back exhaust, and CAI. Would then look into tuning. Seems like I've seen lots of positive reviews of Ecutek, so maybe that route.
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