2001 Mercedes CLK320 P0301 Random Misfire with P136 and P156 Error Codes - Troubleshooting Guide
I'm experiencing a random misfire indicated by fault code P0301 on my 2001 Mercedes CLK320, along with freeze frame data errors P136 and P156. I'm looking for advice on the best first steps to diagnose and resolve this issue. Any insights into potential causes or diagnostic procedures would be greatly appreciated.
For the O2 sensor-related codes like P136 and P156, start by checking all relevant fuses and power connections. For the P0301 misfire code, inspect the wiring and connector to the ignition coil or spark plug related to cylinder 1, as well as verify the integrity of the spark plug itself. Additionally, consider whether a recent tune-up has been performed—this could impact performance and fault detection. A thorough inspection of these components is recommended before moving on to more complex diagnostics.