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1997 Mercury Marquis P0136

Tiny
ENGR
  • MEMBER
  • 1997 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 86,000 MILES
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?
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Tuesday, September 29th, 2009 AT 2:29 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
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.
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Tuesday, September 29th, 2009 AT 2:57 PM
Tiny
ENGR
  • MEMBER
  • 2 POSTS
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?
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Tuesday, September 29th, 2009 AT 8:55 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
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.
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Wednesday, September 30th, 2009 AT 2:29 AM

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