Fuel Injector Circuit Malfunction Cylinder 1 (Ford)
What does P1201 mean?
The P1201 code means the vehicle's onboard diagnostic system has detected: Fuel Injector Circuit Malfunction Cylinder 1 (Ford). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Cylinder 1 misfire
- Rough idle
- Loss of power
- Increased exhaust emissions
Probable Causes (Ranked by Likelihood)
- Faulty cylinder 1 fuel injector Very High
- Open or short in cylinder 1 injector wiring High
- Corroded injector connector on cylinder 1 Moderate
- PCM driver circuit fault for cylinder 1 Moderate
- Injector harness chafing on engine component Low
Step-by-Step Diagnostic Procedure
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Measure cylinder 1 injector resistance and compare to specifications
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Check the connector at cylinder 1 injector for corrosion or damage
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Use a noid light to verify injector pulse signal at cylinder 1
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Swap cylinder 1 injector with another cylinder to see if the code follows
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Inspect wiring from the PCM to the cylinder 1 injector
Frequently Asked Questions
Is P1201 the same as P0201?
They are related but different. P0201 is the generic OBD-II code for cylinder 1 injector circuit malfunction, while P1201 is Ford's manufacturer-specific code that may have different detection criteria or thresholds.
Can a bad injector cause a misfire code too?
Yes. A faulty injector that does not deliver fuel properly will cause a misfire on that cylinder. You may see both P1201 (injector circuit) and P0301 (cylinder 1 misfire) set together.
How do I find cylinder 1 on my Ford?
On Ford inline 4-cylinder engines, cylinder 1 is at the front of the engine. On Ford V6 and V8 engines, cylinder 1 is typically the front cylinder on the passenger side (right side). Check your service manual for your specific engine.