B Camshaft Profile Actuator C Control Circuit/Open Bank 1

Where it lives

For P03F1, the circuit described runs through the actuator. The description of P03F1 puts it on bank 1.

What to check first

For P03F1, check the bank 1 reading against the other bank before buying parts, since if only one side is out of range that side is the fault.

Check these first

• P03F1: Failing ignition coil, spark plug, or spark plug wire
• P03F1: Faulty crankshaft or camshaft position sensor
• P03F1: Wiring or connector damage in the ignition circuit
• P03F1: Low compression or engine mechanical wear
• P03F1: Incorrect ignition timing or a stretched timing chain

What to do next

P03F1 is a fault in the ignition and misfire system. The steps below are general, so what actually failed on your vehicle may not be what P03F1 names.

1. P03F1: Read misfire counts and freeze frame data with an OBD-II scanner
2. P03F1: Test spark output and inspect spark plugs and coils
3. P03F1: Check crankshaft and camshaft position sensor signals while cranking
4. P03F1: Swap suspect ignition parts between cylinders to see if the fault moves
5. P03F1: Compression test if the issue persists on the same cylinder

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