P0420 Catalyst system efficiency below threshold. This system is called obd1 and applies to most vehicles made before 1995 for domestics and 1993 on imports. Immediately depress the accelerator fully and release fully 5 times in quick succession. BMW cam timing Fault Code Readers and OBD Scan Tools for BMW 3 Series E30 (1984-1991) OBDII BMWs can tell owners almost anytime something is going on with a system function, but the proper tools are required. Use either an OBD1 or an OBD2 scanner, depending on the age and computer system of your vehicle. And it can read trouble codes, clear trouble codes, displays live data stream, clear adaption and vehicle information. Select BMW Key Match (OBD Function) CGDI BMW requires to update CAS4 ECU before perform key programming NEXPEAK NX501 Enhanced OBDII Auto Code Scanner Colorful Screen 10 Modes OBD Diagnostic Tool Emission SMOG Checker. While OBD1 can give you up to 300 data parameters. OBD not required in federally certified vehicles in this GVWR range during these years. Each individual combination of letters and Code Description Code 12 No distributor reference pulse (diagnostic test active) Code 13 Oxygen sensor circuit open or no B2424. There’s no formula to decode these codes automatically. Bmw obd1 codes See BMW bulletins for more details.
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