What does code P0091 mean?

P0091 — Fuel Pressure Regulator 1 Control Circuit Low. Belongs to the powertrain.fuel system. Severity: warning.

What are the common causes of P0091?

Short to ground or low signal; Faulty wiring or connector; Faulty sensor

Can I drive with code P0091?

Limited: reaching the nearest workshop is fine, but avoid long trips. May progress into a more serious fault.

How do I diagnose P0091?

Read the code and freeze-frame with a scanner, check related-system errors, inspect the components listed (wiring, connectors, sensors). See the "How to diagnose" section above for the full step-by-step.

How do I clear code P0091?

The code can be cleared via an OBD-II scanner (e.g. ELM327 + the Car Diagnostics app): plug the adapter into the OBD port, go to Errors → Clear. If the underlying cause isn't fixed, the code will return within a few drive cycles.

OBD-II Code P0091 — Car Diagnostics Platform

What it means

Common causes

Short to ground or low signal
Faulty wiring or connector
Faulty sensor

How to diagnose

01
Read all stored and pending codes with an OBD-II adapter — get the full picture, not just the one code.
02
Capture freeze-frame data (RPM, coolant temperature, engine load) at the exact moment the code triggered.
03
Inspect the named subsystem with our app's AI explanation — get vehicle-specific causes for your make, model and year.

Decode P0091 on your actual car

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