CHECK 02S AND INTAKE VACUUM LEAK

  • Tiny
  • HUTCH
  • 1998 Mercury Mystique
  • 90,000 miles

Good morning, found 1 of my 02s on bank 1, It has 2 white wires 1 black and 1 grey. Now can I test the sensor with dc volt-meter, using black and grey wire and a torch (bench test). Now if that's not the problem, I'm going to try and find intake leak, I have heard that a propane torch can be used for this, sounds crazy! So what's the right way to test my HO2 sensor & for intake leak, the code was P1131 1998 merc. Mystique?

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Thursday, April 5th, 2012 AT 11:33 AM

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  • Tiny
  • Wrenchtech
  • Expert
  • 20,000 posts

Apparently the other question was deleted now.

No, no, no. You can't bench test an 0/2 sensor. The propane test is to richen the fuel mixture by introducing propane through the intake to see if the 0/2 responds. There are no lit torches anywhere.

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Thursday, April 5th, 2012 AT 12:39 PM
  • Tiny
  • HUTCH
  • Member

Hi Wrenchtech,
Hutch here I wasn't talking about a lit torch, just the gas for manifold leak. The Lit torch for checking o2s and a mufti-meter.
Thanks!

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Thursday, April 5th, 2012 AT 7:18 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,000 posts

Same answer. Can't be done.

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Thursday, April 5th, 2012 AT 7:19 PM

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