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#1
08-30-2010, 09:42 PM
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97 Expedition, NO numbers from rear o2
Guy at work. Like it says, NO information from either rear o2 sensor. as in bank 1 sensor 2 and bank 2 sensor 2. Just hooked it to my reader in the 10 minutes I had, did not put a meter on the sensors themselves, just seems unlikely that it would have 2 bad sensors at once. I traced the harness up to the firewall from the sensors and its not chaffed or anything, any ideas? Both rear sensors read 0.000 on a scanner, no info from them at all.
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10 hours away from John Deere master certified also master certified ASE tech. Exp. in both. Went to school for cars, wound up staying with Deere dealer for a while, so schooling there too. Also couple years exp in GM and some GM training Gave up wrenching for "Greener Pastures" Current job: RN 2010 Silverado Z71 5.3L 65xxx Wife's 2007 Suburban 1500 LTZ 5.3L 102xxx 
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#2
08-30-2010, 10:58 PM
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Re: 97 Expedition, NO numbers from rear o2
Check the Heated oxygen sensors (HO2) fuses.
(4-wire)
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#3
08-31-2010, 06:41 AM
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Re: 97 Expedition, NO numbers from rear o2
No kidding? The 02 sensors are on fuses? I will tell him to check that; its his fiances rig. They live together, but he rarely drives it.
__________________
10 hours away from John Deere master certified also master certified ASE tech. Exp. in both. Went to school for cars, wound up staying with Deere dealer for a while, so schooling there too. Also couple years exp in GM and some GM training Gave up wrenching for "Greener Pastures" Current job: RN 2010 Silverado Z71 5.3L 65xxx Wife's 2007 Suburban 1500 LTZ 5.3L 102xxx
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#4
08-31-2010, 04:03 PM
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Re: 97 Expedition, NO numbers from rear o2
Got a schematic, there is no fuse protection that effects the sensors. Just need to ohm them I guess and see if the sensors are even working. By looking at the schematic it is either that both sensors are bad or it needs a pcm. I find either unlikely, but I'll get him to bring it to me to look at further; I'll let ya know.
__________________
10 hours away from John Deere master certified also master certified ASE tech. Exp. in both. Went to school for cars, wound up staying with Deere dealer for a while, so schooling there too. Also couple years exp in GM and some GM training Gave up wrenching for "Greener Pastures" Current job: RN 2010 Silverado Z71 5.3L 65xxx Wife's 2007 Suburban 1500 LTZ 5.3L 102xxx
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