OBD Guide
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P128F

Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect

P128F is an OBD-II diagnostic trouble code meaning: Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect. Common causes: malfunction of fuel pressure sensor no. 1 or no. 2, open or short circuit in the sensor circuit. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • Unstable engine operation
  • Power Loss
  • Increased fuel consumption
  • Check Engine Light Is On
  • Problems starting the engine

Causes

  • Malfunction of fuel pressure sensor No. 1 or No. 2
  • Open or short circuit in the sensor circuit
  • Poor connection in sensor connectors
  • ECU software problems
  • Mechanical damage to the fuel rail

How to Fix

  1. Check the condition of the fuel pressure sensors
  2. Inspect the sensor circuit for damage
  3. Check sensor connectors and contacts
  4. Scan the ECU for errors
  5. If necessary, replace faulty sensors

Related codes

P128EP1290

FAQ

What does the P128F code mean?

P128F is an OBD-II diagnostic trouble code that indicates: Fuel Rail Pressure Sensors 1 and 2 Signals Message Counter Incorrect

What causes a P128F error code?

The most common causes of P128F include: Malfunction of fuel pressure sensor No. 1 or No. 2; Open or short circuit in the sensor circuit; Poor connection in sensor connectors; ECU software problems.

How do I fix a P128F diagnostic trouble code?

To fix P128F: Check the condition of the fuel pressure sensors. Inspect the sensor circuit for damage. Check sensor connectors and contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P128F?

Limited driving only, diagnose soon

How much does it cost to fix P128F?

The estimated repair cost for P128F is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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