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Found: 6

Fault codes 1

P0171System too lean (bank 1) — air leak or not enough fuel

Code sections 1

Mixture: lean and richLean and rich mixture. The best known codes grow from here — P0171 and P0172 — while the P21xx codes state…

Step-by-step guides 1

Reading a fault code: the letter and four digitsP0171 is not a random string but an address. We take it apart, sign by sign.

Articles 3

Fault code P0171: where to start«System too lean» is the most common entry in the engine memory. The cause is almost never the part people…Lean and rich mixture: P2177, P2187, P2195 vs P0171These codes do not merely say «the mixture is wrong» — they say **where** and **when**: at idle or under…What the letters and digits in a fault code meanP0171, C0035, U0100 — five characters, and each says something. Once you can read them, an unfamiliar code…