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#1
09-23-2009, 04:14 PM
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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 04:22 PM. Reason: spelling 
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#2
09-24-2009, 01:51 PM
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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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Current Garage: 2009 Honda CR-V EX 2006 Mazda 3i 2004 Chevrolet Silverado 2500HD 2003 GMC Envoy XL 2000 Honda ST1100 2000 Pontiac Sunfire Vehicle History: 2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat.
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#4
09-25-2009, 03:52 PM
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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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| oxygen , po135 , s12 , sensor |
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