P02F6 medium Severity

P02F6: Cylinder 9 Injector Circuit Range/Performance

May cause rough idle, reduced power, and decreased fuel economy; engine may still run but with noticeable performance issues

Overview

P02F6 OBD-II code generic powertrain fault indicating an out-of-range or performance issue with the fuel injector circuit for cylinder 9, commonly due to injector electrical or mechanical faults

Common Symptoms

  • Check Engine Light illuminated
  • Rough engine running or misfire
  • Reduced engine power
  • Decreased fuel efficiency

Most Common Causes

Faulty or clogged fuel injector on cylinder 9 high

Injector malfunction often triggers circuit range/performance fault

Damaged, corroded, or loose wiring/connectors in the injector circuit high

Electrical issues frequently reported in community diagnostics

Open or short circuit in injector wiring harness medium

Can lead to abnormal signal and injector performance errors

Engine Control Module (ECM) or injector driver failure low

ECM-related causes less common but possible

Diagnostic Steps

  1. Use an OBD-II scanner to confirm P02F6 and freeze frame data
    Expected: P02F6 code present; additional stored codes may appear
    Interpretation: Validates injector circuit issue and contextual operating conditions
  2. Perform visual inspection of wiring harness and connector at cylinder 9 injector
    Expected: No damaged, corroded, or loose connections
    Interpretation: Identifies obvious electrical faults
  3. Measure injector resistance with a multimeter
    Expected: Resistance within manufacturer specification
    Interpretation: Out-of-spec resistance suggests injector failure
  4. Check for voltage and injector pulses with engine running
    Expected: Proper voltage supply and pulsing signal
    Interpretation: Absent or irregular signal indicates circuit or driver fault
  5. Swap with another known good injector (if applicable) or test with direct power supply
    Expected: Functional injector behavior
    Interpretation: Confirms injector mechanical or electrical failure

Repair Solutions

Replace faulty fuel injector on cylinder 9 medium
Estimated Cost: $150 - $600

Injector replacement cost varies by vehicle and labor

Repair or replace damaged wiring or connectors medium
Estimated Cost: $50 - $300

Connector repair often resolves electrical faults

Clean or service fuel injector easy
Estimated Cost: $20 - $150

Effective if injector is simply clogged

Replace ECM or injector driver module (rare) hard
Estimated Cost: $500 - $1500

Only if confirmed faulty after all other diagnostics

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming general fuel delivery issues or fuel pump failure without isolating cylinder 9 injector circuit

Frequently Asked Questions

What does a P02F6 diagnostic trouble code signify?

The P02F6 code stands for Cylinder 9 Injector Circuit Range/Performance. This generally indicates an issue with the Fuel System system.

Reflecting on severity: How bad is P02F6?

This is a medium priority issue. May cause rough idle, reduced power, and decreased fuel economy; engine may still run but with noticeable performance issues

Symptoms associated with DTC P02F6

Drivers often report: Check Engine Light illuminated, Rough engine running or misfire, Reduced engine power when this code is present.

Why is my car throwing a P02F6 code?

It can be caused by several factors, most notably: Faulty or clogged fuel injector on cylinder 9, Damaged, corroded, or loose wiring/connectors in the injector circuit, Open or short circuit in injector wiring harness.

Estimated repair costs for different causes of P02F6

The cost varies significantly based on the root cause. For example, replacing a Clean or service fuel injector typically costs between $20 and $150, while fixing a Replace ECM or injector driver module (rare) can range from $500 to $1500.

What cars are affected by the P02F6 code?

This is a universal code. You might see P02F6 on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

User Comments (0)

Share your experience or ask a question about this code.

Be the first to share your experience with P02F6!