'79 242 DL A/C Auto trans P/S 120K. Do you think it should have an O2 sensor or not. It is a MI car here in Maine, and I had the exhaust done at a shop. Is a Lambda Sond badged car, which should indicate an O2 sensor presence. I don't see it and no wire leading to right before the cat. Just spent 2200 for a ton of work that I didn't have the time/garage to do myself (like I would have), but is running a bit rough now @idle only. Could be the cause, but a little cold up here to get down on the ground when the shop that replaced the Y-pipe could be lookin at it. Please let me know...
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