Overview of Troubleshooting

The DTC P0453 can be set if any of the following conditions occur: Faulty fuel differential pressure sensor, related circuit, ECM (M/T) or PCM (A/T).
To check a system blockage, do a performance test which uses a mechanical vacuum gauge and scan tool (MB991502) set on the fuel tank differential pressure sensor (TANK PRS SNSR 73). The mechanical gauge reading is used to verify the reading from the scan tool. A comparison of the mechanical gauge to the scan tool determines the problem in the system.