Member
i have bm328xi 2008 n52 engine it's been throwing codes P0420 P0430 with the service engine soon light in February I replaced catalytic converters and one of the O2 sensors and I replace the camshaft sensor and the crankshaft sensor and I replace the gasket valve cover because it was leaking and I replace the electrical water pump and the thermostat and I replaced a mass air flow sensor and from a month ago I did a smoke test and found two leaks so I put new seals did the test again no leaks were found
and I replaced the spark plugs and coils last year
Member
Is your Catalytic converter OEM?
maybe you need to change both upstream sensors.
Wagon meister :)
BMW Tech Expert
I would wonder what lead to this road? Normally catalytic converters just don't go bad, for they are made to last the lifetime of the vehicle, so something lead to it's early demise.
Also sound like you are just throwing parts at this car, what diagnostic tool are you using to read codes?
Darin
Current:
16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
Past:
95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
82 528i euro Saphire Blue Met/Blue Leather RIP
79 525 euro Green/Green RIP
79 318 Silver/Black - The first one that got it all started
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