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93 850 Failed Smog 850

well if its saying your o2 is bad or missing then it probably is.
Your car is running lean and since there is no front 02 (according to the computer) it runs the engine as if it was just started in the morning. Lean
Is it the original o2? How has your gas mileage been? If the o2 was replaced did you put the proper one in? There are bout 5 different ones for the 850 depending on engine/pump.
Check your maf wiring harness. Then can disconnect from vibration.






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