I have a 99 Ford Contour V-6> Although it is fun to drive but it always giving trouble. The car come up with 4 code:System Efficiency Below Threshold (Bank1, Bank 2) and system too lean(Bank1 and 2). After i saw this appear, i change both upstream O2 sensors, but it doesn't seem to help. My question is " are there one component failure can cause those 4 code to come up at same time??"
I have recently change to K&N air filter, is it related??
2007-03-04
14:56:02
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5 answers
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asked by
Anonymous
in
Cars & Transportation
➔ Car Makes
➔ Ford
I was thinking about the DPFE sensor or MAF sensor or EGR, is it possible??
2007-03-04
15:02:07 ·
update #1