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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > no CEL for catless downpipe
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      08-04-2020, 01:25 PM   #45
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So I just tried this to pass emissions, and I got a CEL after 120 miles. I installed the spacer on the rear O2, did I do something wrong? Not sure how you all are going 10s of thousands of miles without a CEL, I got one after 120.
Try using both spacers. What sets the code is temperature not necessarily CO levels.
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      08-05-2020, 10:02 PM   #46
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Try using both spacers. What sets the code is temperature not necessarily CO levels.
Already got the stock cat on and passed inspection, but thank you for the thought nonetheless
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      08-06-2020, 02:45 PM   #47
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try using both spacers. What sets the code is temperature not necessarily co levels.
already got the stock cat on and passed inspection, but thank you for the thought nonetheless :d
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      09-24-2020, 12:14 PM   #48
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do you put both the fouler on both of the sensors on the vrsf
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      09-24-2020, 05:26 PM   #49
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Fouler goes on the downstream sensor. Also years ago we used to put a resister into the o2 sensor wire to show that it was "heated" and didn't trigger the ecu.
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