P0268

What the Code Means

Code P0268 points to high voltage in the cylinder 3 fuel injector circuit. The engine control unit (DME) has detected increased resistance or an open circuit in the injector control circuit. The affected system is the direct fuel injection system. Components involved: cylinder 3 fuel injector, wiring, connectors, DME.

Symptoms

• Engine: misfires, rough idle, hesitation under acceleration
• Indicators: Check Engine Light (CEL) on
• Conditions: symptoms can appear across all engine operating ranges

Diagnosis and Repair

Step 1: Check Injector Resistance

• Disconnect the cylinder 3 fuel injector connector.
• Measure resistance across the injector terminals with a multimeter.
• Spec: 12–16 ohms. If resistance is out of range or there's an open circuit, the injector is bad.

Step 2: Inspect the Wiring

• Check continuity of the wires from the injector connector to the DME.
• Look for damage, corrosion, and poor contacts.
• Repair the wiring if needed.

Step 3: Replace the Injector

• If the injector is bad, replace it with a genuine BMW part (13647597896).
• After replacement, run the injector adaptation through ISTA/INPA.

Related Consequences

Ignoring the fault can lead to:

• Catalytic converter damage from unburned fuel.
• Failed oxygen sensors (O2/lambda).
• Higher fuel consumption and reduced engine power.

Fix the fault as soon as possible to avoid expensive exhaust system repairs.