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Trouble code libraryFuel and air

P0191 Fuel rail pressure sensor A circuit range/performance

Code familyFuel and air measuring fault

Drive gentlyYou can drive it, but take it easy and get it looked at soon – waiting usually makes the repair bigger.

Check this first

Check the air filter, intake hoses and sensor connectors before replacing anything.

What usually fixes it

In the order a good shop checks them. Typical total: $114–$925 at $130 an hour.

  1. Sensor plug or wiring

    $114–$282

    Connector problems mimic dead sensors.

  2. Injector or mixture fault

    $248–$925

    Lean, rich and injector codes usually live here.

This is the advice for this family of codes – Drive DTC doesn't have advice written for P0191 on its own yet.

Code titles are the generic SAE definitions. Prices are typical US parts and labor for a common car or light truck – a guide for judging a quote, not a quote. Always confirm a repair against the vehicle in front of you.

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See what your vehicle says about P0191

A stored code is a headline, not the story. The vehicle also holds the conditions from the moment the code set, how close each part is to the limit it fails at, what the fuel trims are doing, and whether the fault is still happening. Drive DTC reads all of it with a USB adapter and a Windows PC – read-only by design.

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The Trouble codes screen in Drive DTC: stored, pending and permanent counts, then C0040-13 explained in plain English with what to check first, likely fixes in order and typical cost ranges

More in Fuel and air

All 73 codes in this group
P0172System too rich (Bank 1) P0174System too lean (Bank 2) P0175System too rich (Bank 2) P0192Fuel rail pressure sensor A circuit low P0193Fuel rail pressure sensor A circuit high P0201Injector circuit/open – cylinder 1