How do i know which o2 sensor is bad with a bad sensor code???
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New User
Joined: Feb 2004
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How do i know which o2 sensor is bad with a bad sensor code???
if my code was PO130 - PO135, those are all "bank no 1 Sensor no 1" which is number 1? anybody? anybody??
truck
97 expy 5.4l vin L
thanks in advance.
truck
97 expy 5.4l vin L
thanks in advance.
Post Fiend
Joined: Jun 2003
Posts: 5,983
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I'm sorry, the O2 sensors are in the exhaust, after the manifolds. Crawl underneath and have a look. Number one is upstream of the cat and number 2 is after the cat. The sensors on the air box (to my knowledge there is only one) would be IAT (Intake air temperature) and MAF (Mass Air Flow).
Bank 1 is passenger side bank 2 is drivers side. Number 1 is upstream (before the cat) between the manifold and the cat and number 2 is downstream from the cat.
Bank 1 is passenger side bank 2 is drivers side. Number 1 is upstream (before the cat) between the manifold and the cat and number 2 is downstream from the cat.
Logistics Pro
Joined: Oct 2000
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From: All over Texas
There are 4 sensors, but only two affect engine performance. The second two, downstream, only monitor the cats performance.
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