[Main C900 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos Is the O2 sensor a variable resistor? Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by IrieTom [Email] (#1032) [Profile/Gallery] (more from IrieTom) on Wed, 16 May 2001 11:16:37 In Reply to: the resistance of a plug in connection..., Monster, Wed, 16 May 2001 10:21:20 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

I'm not worried about my mechanic trying to rip me off- he's hooked me up with top-notch (SAAB master mechanic) service at a fraction of dealership prices. This little nugget of information came up as we were discussing cold-idle problems in the early 16v Turbo engines, and had no bearing whatsoever on the work which was recently done on my car (refer to my recent postings).

The big IF in this discussion is whether or not the O2 sensor is an electrical device whose data output is a resistance in the 1-ohm range. A good soldered connection will still have a resistance of a tenth of an ohm or so. If this is the case, then 2 soldered connections in series with the ~1-ohm resistance of the O2 sensor will change the measured resistance by approximately 20%. If the operating range of the O2 sensor is 0.1ohm-150ohms, the error will range from 200% to 0.13%.

It made sense to me at the time, and still does IF AND ONLY IF my assumption about the operating range of the O2 sensor is true. Anyone who can explain the electrical principles behind the function of the O2 sensor should be able to either validate or debunk this point.

I'm not trying to convince anyone that my postulation is absolute truth- I'm merely curious about the variables that can effect the operability of my car. I try to entertain as many perspectives as possible in the quest for a comprehensive understanding of the behavior of these machines.

• speaking of Bosch O2 generic sensors, ran into a mechanic....., mike, Wed, 16 May 2001 00:32:22
  • full of crap, dave n, Wed, 16 May 2001 19:40:02
  • He's not nuts or stupid..., formulavee65, Wed, 16 May 2001 12:32:25
    • Re: He's not nuts or stupid..., jAri, Wed, 16 May 2001 12:48:44
  • Horse manure, Ari , Wed, 16 May 2001 11:12:49
    • Re: Horse manure, rodel, Wed, 16 May 2001 16:41:42
    • Thanks, Ari-, IrieTom , Wed, 16 May 2001 11:26:14
  • the resistance of a plug in connection..., Monster, Wed, 16 May 2001 10:21:20
    • Well said..........nm, Jim Moncrief, Wed, 16 May 2001 12:48:50
    • Is the O2 sensor a variable resistor?, IrieTom , Wed, 16 May 2001 11:16:37 <-- Viewing This Message
      • No, it isn't, Ari , Wed, 16 May 2001 13:43:33
        • DON'T try to measure resistance of an O2 sensor, Fimum Fit, Wed, 16 May 2001 14:28:43
  • The keys to making it work right are good solder joints and ..., RS , Wed, 16 May 2001 09:41:11
  • he is not completely wrong, but, KeithG, Wed, 16 May 2001 09:35:14
  • My mechanic says the exact same thing..., IrieTom , Wed, 16 May 2001 09:17:24
  • He's out to lunch., JohnB, Wed, 16 May 2001 07:26:59

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