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Hi All.
I am scratching my head for a poor friend of mine.
We tried to get the NYSI (inspection) done before it was overdue and the check engine light came on with the above code.
Now car is 2 months overdue and still cannot keep the light out.
Car seems to run just fine.
The code is always the only code.
First thing I did was to replace the B1S1 Air fuel ratio sensor. (B1S1)
I inspected the harness as far as I could. Looks fine.
I checked the ground cable from the battery to Tower, and from the tower to the engine and it is secure. Rusty but no more than surface. (usual for NY)
downstream pipe and B1S2 got replaced as well. So new downstream cat as well. It bears to mention that when the flexpipe broke is the same time the light came on.
I thought for sure the new pipe would have resolved the issue. It has been cleared multiple times but it comes back within a few trips.
I have tried the Ratio relearn with the MAF at least 3 times exactly like The procedure showed and it runs great but still no luck.
Engine does not miss or run rough. Gets good mileage.
Monitoring with scantool shows
AT IDLE WARM AVERAGE VOLTS 0.35
HIGHWAY DRIVING AVERAGE VOLTS 1.75- 3.0
If anyone has any insite I would so appreciate it.
Thanks all
 
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