Code Definition

P2004 (04) — Manifold Air Pressure Signal Mismatch Between Sensors 1 and 2

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Mercedes-Benz

About P2004

P2004 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Mercedes-Benz vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2004 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2004 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

DTC P2004 with sub code 04 is a Mercedes Benz specific code that sets when the Engine Control Module (ECM) detects a discrepancy between two manifold absolute pressure (MAP) sensor signals that should agree. The ECM continuously compares MAP Sensor 1 and MAP Sensor 2 and expects their pressure readings to correlate within a defined tolerance under the same operating conditions. P2004 sets when the difference between the two signals exceeds the allowable threshold, indicating one sensor is reading incorrectly, a manifold or vacuum leak is affecting one sensor, or a wiring fault is skewing a sig...

Join TaT to view the complete code information and diagnostic details.

Quick Facts