Question about Cars & Trucks
Is the bank 1 sensor 2 considered the upstream or downstream? Before the catalytic converter or after? Is it the one that comes right after the Y where the to manifolds meet? the code was P0141
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Posted on Jan 02, 2017
SOURCE: replace oxygen sensors
these engines have 1 upstream o2 sensor and 1 downstream o2 sensor..the 1 in the rear exhaust manifold is the upstream and the 1 after the converter is the downstream..make sure you replaced the right one
Posted on May 16, 2009
SOURCE: oxygen sensor confusion
1/1 is upstream sensor on the number 1 cylinder side, 1/2 is the downstream of the number 1 cylinder side, 2/1 is the upstream of the number 2 cylinder side, 2/2 is the downstream of the number 2 cylinder side. Hope this helps.
Posted on Aug 10, 2009
Testimonial: "sorry, I hit the submit testimonial button before thanking both of you who so promptly answered. "
SOURCE: P0420 and P0430
The AF sensors are uupstream and the O2 down stream. The car' s computer tests them and it is saying your cats are bad. If you have a scan tool you could look at the data and see what the sensors are seeing. The Af sensors are the ones that control the fuel ratio in the car while the O2's just watch. AF's would be the one to change but there is no garuatee that the codes won't come back.
Posted on Sep 25, 2009
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