P0201 on Mercedes-Benz: Symptoms, Causes & Fix
Official technical diagnostic wire for fault code P0201 specifically affecting Mercedes-Benz vehicles (C-Class, E-Class, S-Class, GLC, GLE).
Select Your Mercedes-Benz Model for P0201:
1. Common Symptoms on Mercedes-Benz Vehicles
When Mercedes-Benz Engine Control Modules (ECM) trigger fault code P0201, drivers typically report:
2. Root Causes on Mercedes-Benz Engines
Historical diagnostic claims across Mercedes-Benz engines point to the following failure distribution:
3. Step-by-Step Fix Protocol for Mercedes-Benz
Locate Cylinder 1 fuel injector. Ensure connector is securely clicked in and wires are not frayed. on Mercedes-Benz engines.
Unplug connector and measure resistance across the two injector pins. Normal is 11–16 ohms for high-impedance injectors. If open (OL) or shorted (0 ohms), replace injector. on Mercedes-Benz engines.
Plug a noid light into the harness connector and crank engine. Rapid flashing confirms PCM driver is pulsing the circuit. on Mercedes-Benz engines.
Relieve fuel rail pressure, unbolt fuel rail mounting bolts, gently pull rail up, remove retaining clip, and replace Cylinder 1 injector with new OEM unit with lubricated O-rings. on Mercedes-Benz engines.
Turn key to ON to prime fuel system, check for fuel rail leaks, start engine, clear DTCs, and verify smooth idle. on Mercedes-Benz engines.
Equipment for Diagnosing Mercedes-Benz (P0201)
Mercedes-Benz OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Mercedes-Benz.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
4. Mercedes-Benz P0201 Frequently Asked Questions
What does code P0201 mean on a Mercedes-Benz?
On Mercedes-Benz vehicles, P0201 indicates that the Engine Control Module (ECM) detected injector circuit malfunction - cylinder 1. This typically points to Failed, open, or shorted fuel injector solenoid on Cylinder 1 or Damaged or chewed wiring harness to Cylinder 1 injector.
Can I continue driving my Mercedes-Benz with code P0201?
No. Dead injector on Cylinder 1 causes immediate dead misfire, severe shaking, and unburned air/fuel delivery imbalance. Because this code carries a Critical severity rating on Mercedes-Benz powertrains, we recommend scanning live data values promptly to prevent secondary damage.
How much does it cost to fix code P0201 on a Mercedes-Benz?
Estimated DIY parts cost ranges from $150 - $550 (DIY: $40 - $180), while professional shop repairs at an authorized Mercedes-Benz dealership or independent specialist typically range from $180 to $380 including diagnostic labor.