What Does P02F4 Mean?
The ECM has detected that the Cylinder 7 fuel injector circuit is operating outside the expected electrical range or performance parameters. The injector's electrical signature deviates from calibrated values, indicating a component or circuit fault on Cylinder 7. This applies to V8 and larger engines.
Common Causes
35%
Degraded Cylinder 7 fuel injector with shifted coil impedance or mechanical response affecting circuit performance
25%
Corroded or high-resistance connections in the Cylinder 7 injector wiring, often heat-related on V8 rear cylinders
20%
ECM injector driver circuit issue on the Cylinder 7 output channel
20%
Mismatched replacement injector in Cylinder 7 with different electrical specifications
Diagnostic Steps
1
Step 1: Measure Cylinder 7 injector coil resistance and compare to specification. On V8 engines, rear cylinder injectors are more exposed to heat which accelerates coil degradation.
2
Step 2: Capture the Cylinder 7 injector current waveform with an oscilloscope. Compare to Cylinder 5 and 8 waveforms (same bank) to identify anomalies.
3
Step 3: Inspect the Cylinder 7 injector connector and harness for heat damage, corrosion, or melted insulation from proximity to exhaust components.
4
Step 4: Swap Cylinder 7 injector with another cylinder on the same bank. Clear codes and retest to determine if the fault follows the injector.
5
Step 5: Verify the correct injector part number and calibration codes are in place for Cylinder 7.
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The ECM has detected that the Cylinder 7 fuel injector circuit is operating outside the expected electrical range or performance parameters. The injector's electrical signature deviates from calibrated values, indicating a component or circuit fault on Cylinder 7. This applies to V8 and larger engin...
The most common cause of P02F4 (Cylinder 7 Injector Circuit Range/Performance) is: Degraded Cylinder 7 fuel injector with shifted coil impedance or mechanical response affecting circuit performance
Typical repair costs for P02F4 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Injector circuit issues on Cylinder 7 cause imprecise fueling and misfire potential. On V8 engines, this affects Bank 2 catalyst health and overall emissions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02F4 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
Recommended Tools
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