CEL (Faults P2179 & P2177)

[Lugos]

Firstly, a big thank you to everyone that contributes to this forum. It has been a great help and source of information - both prior to purchasing my QP three years ago (thanks again @dickygrace ) and ever since.

As the title suggests, it threw up a Check Engine light yesterday whilst pottering around town. I crawled back home and engine seemed fine/smooth (although I didn't go above 2k RPM - I even (reluctantly) took it out of Sport mode just to be safe). It also seems to start fine. I plugged in a code reader this afternoon (thanks @CatmanV2 for the Autel suggestion on recent thread) and it gave me P2179 & P2177 (main bearing mixture multiplying ratio self-teaching (mixture too lean) - for both LHS and RHS). I read elsewhere that this a fuel/air mix issue. Any suggestions for what a relative layman could check / do? And is it worth just clearing the code to see if it comes back, or should I really just be taking it in to a pro?

Thanks very much in advance for any advice.

Photo of it in healthier times below for good measure.

 

[Zep]

Resetting will do no harm, it will come back if it is constant.

Too lean is most likely a vacuum leak giving false air to the engine, so check the hoses you can see around the throttle body or inlet manifold. Also the hose to the brake servo.

 

[Lugos]

Resetting will do no harm, it will come back if it is constant.

Too lean is most likely a vacuum leak giving false air to the engine, so check the hoses you can see around the throttle body or inlet manifold. Also the hose to the brake servo.

Thanks, Zep - much appreciated. Will give it a go / have a check.

 

[Sam McGoo]

As Zep says, most likely to be a vacuum leak. Check any connections and all hoses after the MAF.
As its effecting both banks its unlikely to be injectors, loose spark plug, exhaust manifolds etc
Also check all the hoses around the secondary air system.

Ideally you want access to a smoke tester, it'll save you untold amount of time.

 

[philw696]

An easy way to detect a air leak is to spray lightly some brake cleaner and if you hear the revs suddenly rise there is your leak.

 

[Sam McGoo]

I've been hearing people say this my whole life, and have tried it on many occasions using different stuff, brake cleaner, easy start and even gas from a blow torch..... I have never heard any change in revs even though I have gone on to discover a leak.
Dunno why, but never works for me.