P0200
ModerateP0200 — Injector Circuit Malfunction Detected by the Engine Control Module
Description
What the Code Means
Code P0200 points to a fault in the injector circuit detected by the engine control module (DME). On N55 engines this can be caused by wiring problems, corroded connectors, or a failed injector. The code may be general or point to a specific cylinder.
The fuel injection system is controlled by the DME, which sends voltage pulses to the injectors to open and close them. When the circuit is disrupted (open, short, or high resistance), the DME logs the fault and may cut fuel delivery to the affected cylinder.
Symptoms
Symptoms
- Engine: misfires, rough idle
- Behavior: loss of power
- Indicators: Check Engine Light on
Causes and fixes
Diagnosis and Repair
Step 1: Visual Inspection
Check the injector wiring and connectors for damage, corrosion, or loose contacts.
Step 2: Resistance Test
Measure injector resistance with a multimeter. Specification: 0.5–1.5 ohms. A deviation indicates a faulty injector.
Step 3: Injector Replacement
If faulty, replace the injector with an OEM unit (13647597801).
Step 4: Reset and Test
Clear the fault codes and take a test drive to verify.
Possible secondary damage
Indirect / Downstream Issues
Ignoring the fault can lead to:
- Catalytic converter damage from unburned fuel
- Cylinder wall wear from uneven engine operation
Fix the fault as soon as possible to avoid costly repairs.