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This is a list of Mercedes-Benz specific Diagnostic Trouble Codes (DTC) or also known as engine fault codes.
Please note that there are Check Engine / Service Engine / CEL fault codes which are stored in the Engine Control Unit (ECU). These codes can be read and erased with a simple OBD2 code reader, listed under yellow column below.
The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar.
If it is OBD-1 you can use a paper clip to jumper two terminals in the test plug under the dash, and then watch the check engine light flash. If it is OBD-2 you need a code reader or scanner. Most auto parts stores will read OBD-2 systems for free in hopes of selling you some parts.
94 and 95 bonneville's have a odb1 system but the plug under the dash for the code reader is for odb2/. you have to get a code reader that will read odb1 and odb2 with a manufacture special plug to read them. also the computer in the 94-95 are only used in those 2 years. new one at most auto parts stores is about $100.00 cheap compared to other years. if you have lots of codes and it runs good but just turns itself off all the time it's the computer. I had to replace 2 so far one in a 94 and one in a 95.
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