Technical Long term fuel trim -22

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Technical Long term fuel trim -22

ianis

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Hello,
I have a alfa romeo mito 1.4 t-jet (120PS) with A LONG TERM FUEL TRIM of -22.
Sometimes it gets to -25 and throws a P1172 code.
o2s1 is around 0.8V and o2s2 is around 0.4V at idle. I changed the o2s2 sensor and nothing happend.
Intake manifold pressure: 34 kpa.
P.S. I know it is a fiat site but they have a lot in common.:)
 
Hello,
I have a alfa romeo mito 1.4 t-jet (120PS) with A LONG TERM FUEL TRIM of -22.
Sometimes it gets to -25 and throws a P1172 code.
o2s1 is around 0.8V and o2s2 is around 0.4V at idle. I changed the o2s2 sensor and nothing happend.
Intake manifold pressure: 34 kpa.
P.S. I know it is a fiat site but they have a lot in common.:)

Stock or tuned map?

Pre-lambda is stuck at 0.8v at idle?
 
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