Code result
P0191
Fuel Rail Pressure Sensor Circuit Range/Performance
Moderate severity
What it means
The fuel rail pressure sensor signal is within electrical limits but doesn't match commanded rail pressure under various engine loads. Common in common-rail diesel and GDI petrol engines.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Pressure sensor drifted
highOne of the most commonly reported causes for this code — check this first.
Pressure regulator stuck
mediumA plausible cause — test and verify before replacing parts.
High-pressure pump worn
lowLess common, but worth ruling out after the more likely causes.
Related help
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