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Showing results for tags 'p0171 code'.
Hi, I think I may have an issue with the dredged exhaust vales leaking on my Polo 1.2 petrol 9N3, 1ith 186,000 on the clock. I have just completed a compression test and the figures obtained are as follows: Cylinder 1 - 230 & 243 psi Cylinder 2 - 210 & 220 psi Cylinder 3 - 200 & 205 psi I understand that there should be only a 10% difference between the highest and lowest figures and mine has 14% to 17% difference. The engine is running fine with the only ECU error of P0171 lean fuel trim, but only at idle with all sensors
As a new member this is my first post. I have the dreaded P0171 fuel trim system too lean code on my wifes 2008 1.2 9N4 polo which is running fine without any issues of roughness, staling or poor starting. I have run the VCDS test for MAP and Lambda sensors which check out fine, I have checked for any vacuum leaks both visually and with a smoke test all of which are Ok with no leaks. One thing I have noticed in VCDS 01 engine, measuring blocks, block 32 field trim at idle is high at 14% to 18% and understand that this should be below 10%. The check engine light come