P0340 on Ford Focus
Camshaft Position Sensor A Circuit Bank 1 or Single Sensor
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Ford Focus context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for P0340.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What P0340 Means on Your Ford Focus
P0340 is a diagnostic trouble code indicating: Camshaft Position Sensor A Circuit Bank 1 or Single Sensor. This code relates to the ignition system system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Real Ford Focus Owner Reports
Source: NHTSA Complaints Database
"Just filled my gas tank up then as i left the gas station got about 1 mile up the road then while sitting at a stoplight i turned the ac on and idle dipped, car felt like it was going to die(which it did) then as i tried to re-start, cel came on and car would not start."
"Driving car , check engine light came on at 5800 mile, scan tool stated code p0340 and p0344, replace cam sensor."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Ford Focus
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.