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BMW 3-Series (E90 E92) Forum
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Low Catalyst Efficiency!?
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| 03-08-2018, 04:49 PM | #1 |
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Low Catalyst Efficiency!?
My n54 335i is throwing codes for low catalyst efficiency in both banks (P0420 & P0430) and getting terrible gas mileage, rough idle, and misfires. The car has catless downpipes, dci, charge pipe, bov and a jb4 g4. Not sure if this is a tuning issue or if the o2 sensors need to be replaced?
Last edited by scug; 03-08-2018 at 05:27 PM.. |
| 03-08-2018, 05:37 PM | #2 | |
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| 03-09-2018, 12:57 PM | #3 |
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Any recent changes to the vehicle?
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| 03-12-2018, 02:05 PM | #5 |
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I don't see how the codes would be related to that, but I would double check your install if it started right after. MAP sensor and harness should be properly installed. Check that chargepipe is properly seated and sealed on the throttle body.
Otherwise I'd agree you might need to check O2 sensors.
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