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Old 09-23-2009, 03:14 PM   #1
mandtra
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O2 oxygen sensor problems ?

I recently replaced the drivers side CAT and both upstream O2 sensors . The cat was cracked and rattling. The drivers side sensor 1 had a bad heater circuit (Po135), and the O2 sensor 1 on the passengers side would only read .07v constant. where the other three were reading .1 - .7volts.

I replaced both upstream O2 sensors with NGK sensors, and ran another scan today . bank 1 was fine .1 - .7 v (both) , but bank 2 sensor (one) upside was staying at .070 v and sensor 2 downside was .1 - .7 so I assume I have more problems. since the brand new sensor in bank2 sensor one is still reading .07 constant.

What do you think?

Last edited by mandtra; 09-23-2009 at 03:22 PM. Reason: spelling
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Old 09-24-2009, 12:51 PM   #2
jdmccright
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Re: O2 sensor problems ?

I'd test the wires for that sensor for continuity back to the ECM...my bet is that the sensing wire is grounded somehow.
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Old 09-25-2009, 09:56 AM   #3
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Re: O2 sensor problems ?

is it possible a bad cat on that side could cause that low voltage reading?
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Old 09-25-2009, 02:52 PM   #4
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Re: O2 sensor problems ?

Here's an update. I tested the o2 sensor wires from sensor to the PCM. Everything checked out fine. I also warmed the engine up and sprayed starting fluid all around looking for a vacuum leak. no luck there either
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