just need to know somthing the cat coverter has been changed on my r33 and who ever did it did not put the exhaust senser back in the new cat and left it just hanging there should i put it back in? the car seems to running ok.
you should put it back in also for the reason that the ECU tends to make the car run rich when there's no 2ndary O2 sensor (a preventive measure). The cost of someone drilling a bung to put it in would be less than you'd spend in gas over time.
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