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"System too Lean" and "System too Rich" at the same time


veigy
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Hi,

I have a problem on Lupo 1.0 AUC 37kW with fuel mixture. VCDS showing error:

17560/P1152 - Long Term Fuel Trim Additive Air; Bank 1; Range 2: System too Lean
17573/P1165 - Long Term Fuel Trim Additive Air; Bank 1; Range 1: System too Rich

After clearing these errors they comes back in few days. In a month comes on engine light too. Last time I cleared errors I looked on oxygen sensors learning values: -6% on idle and +24% on partial load. The strange thing is that readiness is absolutely OK. Any suggestions? I'm little bit helpless at this moment.

What have been done:
- new oxygen senzor
- cleared throttle body
- replaced some bad looking hoses
- cleared manifold preassure senzor
- changed fuel filter

Pics from VCDS there: https://imgur.com/a/ZehuiX5

57180153_2054909467940176_1319418810939211776_n.jpg

68326291_349581129305112_3791564946718851072_n.jpg

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Do you have a carbon canister? Could be the solenoid.

Could be fuel pressure regulator?

Check vacuum hose to brake servo... or could be dodgy brake servo where the internal air valve is leaky, allowing extra air into the engine? Try disconnecting it temporarily (and block the suction).

might be more than one problem.

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Easier to swap it than test, without the right equipment. Otherwise you might be able to rig up a tyre pressure gauge to the output pressure side. Input pressure should be at least 60psi. Not sure what the controlled pressure is on your model. 45psi? But whatever it is, it should be steady.

No brakes (very high foot force needed).

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