1997 Mercury Marquis P0136

1997 MERCURY MARQUIS
86,000 MILES • V8 • 2WD • AUTOMATIC
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ENGR
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  • 2 POSTS
Replaced O2 sensor Bank 1, #2. Reset. After 100 mile drive and 2-3 on cycles problem came back. Reset again and problem comes back. Checked pigtail and connector and cleaned with alcohol. After 4-5 on cycles, same code. Measured the heater resistance in the disconnected sensor; book says 6 ohms, actual 3.3 ohms. Could a low resistance value cause this code and therefore my "new" sensor be defective?
Sep 29, 2009 at 2:29 PM
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MERLIN2021
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I would say yes, It is the heated circuit monitoring code. Just for the h e l l of it, check your old one too, see what the resistance is on that one.
Sep 29, 2009 at 2:57 PM
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ENGR
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[quote:5e0e84d65c="merlin2021"]I would say yes, It is the heated circuit monitoring code. Just for the h e l l of it, check your old one too, see what the resistance is on that one.[/quote:5e0e84d65c]

Measured resistance of new sensor in store: 3.3 Ohms, same as sensor in the car. Did not purchase. Measured two old sensors: 6.0, 5.9 ohms. Rockauto has Bosch P/N 13133; AutoZone 15717(3.3 ohms). What gives??
Sep 29, 2009 at 8:55 PM
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MERLIN2021
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Don't know about the autozone, or Bosch, I ordered four from rock auto and all was good....wasnt a bosch though...sale parts were 35.00 each.
Sep 30, 2009 at 2:29 AM