P0204
ModerateP0204 — Cylinder 4 Fuel Injector Circuit Malfunction
Description
What the Code Means
The DME detects a fault in the electrical circuit of the cylinder 4 fuel injector. The control unit opens the injector with pulses and monitors circuit status: an open circuit, a short, or resistance outside the allowed range triggers P0204. Fuel delivery to the cylinder is disrupted, which directly affects engine operation.
Symptoms
Symptoms
- Check Engine Light on the instrument cluster;
- misfires in cylinder 4;
- rough idle;
- loss of power.
Causes and fixes
Diagnosis and Repair
Step 1. Check the Injector Wiring
Inspect the harness and connector at the cylinder 4 fuel injector: damaged insulation, corroded contacts, and a poor connection in the connector are a common cause of this code.
Step 2. Check Resistance
Measure the injector coil resistance with a multimeter and compare it to the allowed range. A reading outside spec points to a faulty injector.
Step 3. Replace the Injector
If the wiring is fine and resistance is out of spec, replace the cylinder 4 fuel injector. Original part number — 13647597801.
Possible secondary damage
Secondary Damage
- Misfires in the cylinder send unburned fuel into the exhaust system, which can damage the catalytic converter.
Don't put off the repair: the code is moderate severity, but the risk of converter damage keeps growing the longer you drive with active misfires.