[Notoriousfolb]

3000 miles - straight piped from cats back. Started going into 4k limiter mode. Any ideas?

If I stop and start it goes back to full power mode but it is happening a lot.

[KC87ZB]

Have you scanned for codes?

[Notoriousfolb]

Yes - P112F and P12a5 - any ideas? 3000 miles on the car. WTF. Comes and goes but now more often after second start.

[KC87ZB]

Those two codes show a relationship error between the throttle position sensor and the expected manifold pressure. The system is delivering too far from expected, which would indicate an intake leak somewhere. Charge pipe issue?

I assume you are tuned, this presents more often on tuned cars.

[Notoriousfolb]

As far as I know untuned - it had a straight pipe but I replaced it with OEM - how would I tell if its tuned from looking at the engine bay - it has 3000 miles - almost new. Thanks.

[Notoriousfolb]

Yes dealer says its got a tune

[KC87ZB]

Sorry you found out your answer about the only way possible, from a dealer or from a tuner. Are they going to work with you? I would assume if they sold it to you they would but if you bought it private party they may even void your warranty.

Please let the community know.

[BIGW0RM]

Originally Posted by KC87ZB

Sorry you found out your answer about the only way possible, from a dealer or from a tuner. Are they going to work with you? I would assume if they sold it to you they would but if you bought it private party they may even void your warranty.

Please let the community know.

In California, the dealer makes you sign something saying you didnt tune it when you sell a car back to them. That way the are protected if they do sell a car with a tune. Which means, the OG owner might be liable for repair.

And who the hell tunes a 3k mile old car and sells it back? WTF. That means its most likely only been tuned 1500 miles or so.