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Oxygen sensor - where do I plug it in??connection missing! 200 1979

posted by  ldray on  Wed May 21 04:44 CST 2003
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last visit: Fri Feb 23 01:23 CST 2001
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My 242 is a ball to drive, but the gas mileage is probably lousy.. the ol' reliable odometer failed at least 4 years ago. surprise surprise. I have heard about the oxygen sensor being a big help in improving gas mileage, etc..

So, I purchased one on the net. Didn't bother to look under the hood to find the old one. Ah.. there it is.. but......it's not connected to a darned thing! Looking carefully along the firewall for a wire that's not connected to anything. Here's one.. it's a female plug attached to a green wire with a red collar. I'm guessing that's the one. I looked in my Haynes, and it looks like a green wire connects to this sensor.

I looked at my daughter's '80 245, and of course the connection is completely different, coming through the firewall on the same side as the sensor. My green connector is towards the driver side of the firewall, near the top center.

Any suggestions? I'd like to think that this is the right one, but that means fashioning a connection (no problem there.. IF it's the right one).

I wish I could say that this will make "Brownie" as good as new, but alas...

Thanks,
Larry








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    Oxygen sensor - where do I plug it in??connection missing! 200 1979

    posted by  vvpete on  Wed May 21 09:23 CST 2003
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    last visit: Thu Jul 10 14:10 CST 2014
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    Larry, be sure that you have a '79 with Lambda sound. I have a '78 242 GT that came with Lambda sound and put the re-built engine in that came from my old '79 242DL that had an EGR system. Although I replaced everything as a Lambda system w/ O2 sensor, I learned that not every Volvo had the O2 sensor in use in '79.
    The fact that your car was operating without one says that it may not need one. If the car ran at all with the Lambda system and O2 sensor not hooked up makes me wonder why it ran at all. Check to see if it is an EGR system. If your manifold was replaced, it could have the old O2 sensor there as a plug, not doing anything, and the EGR bypassed. BTW if the sensor was not hooked up, the computer (If equiped) would lean out the fuel to where it would show noticably poor performance.
    If it is an EGR system, a new or cleaned valve would help the mileage issue.
    --
    '89 245 Sportwagon, VX cam,K&N, Bil's, IPD susp & exhaust








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    Oxygen sensor - where do I plug it in??connection missing! 200 1979

    uid 2796's pic
    posted by  bulletproof on  Wed May 21 07:29 CST 2003
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    last visit: Fri Oct 24 12:02 CST 2014
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    The O2 sensor wire (black) does connect to a single green wire with a molded plug that the boot slips over. That green wire should then go through the firewall and winds up as part of a multi wire connector at the Lambda system control unit. The '80 and the '79 Lambda systems in the 240 are identical. Use the 245 as a guide.
    --
    1980 240 DL








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