OBD Codes
Your OBD-II Trouble Codes Repair Site

P02F5 Cylinder #8 Injector Circuit Range/Performance

OBD-II Trouble Code Technical Description

Article by
Don Bowman
ASE Certified Automotive Tech

Cylinder #8 Injector Circuit Range/Performance

What does that mean?

The OBD trouble code P02F5 is a generic powertrain code common to all vehicles. Although the code's reference is the same, the repair procedure may vary somewhat with the manufacturer.

This code implies that the powertrain control module (PCM) has experienced an out of range or performance problem involving the fuel injector for the #8 cylinder in the firing order.

In short, this fuel injector is malfunctioning for one of a variety of reasons. It is important to diagnose and repair this type of problem as soon as possible. When a fuel injector malfunctions, it causes ripples down the line, meaning the engine's operating parameters change due to the mixed signals at the PCM.

This type of problem is better addressed as soon as possible to prevent damage to other internal components. A bad fuel injector will effect the spark plug, cause detonation, effects the oxygen sensor and catalytic converter, and several other components as well.

Refer to a vehicle specific repair manual to determine the location of the #8 cylinder for your particular application.

Cross-section diagram of a typical automotive fuel injector (provided by WikipedianProlific):

Typical automotive fuel injector - cross-section diagram


The symptoms displayed for a P02F5 code may include:


Possible causes for this DTC include:

P02F5 Diagnosis / Repair

Generally, this type of problem is either a loose or corroded electrical connector on the injector, a fouled injector (dirty or plugged) or a bad injector needing replacement.

In over 45 years I have found that loose or corroded connectors were the cause of the electrical fault the majority of the time. I have found but a few cases where low voltage wiring became shorted or open (when left undisturbed).

The majority of electrical problems were alternator related, starter solenoid wiring, oxygen sensor wiring due to the close proximity to the exhaust and battery related. The majority of electrical work was correcting customer-installed items such as high-power stereos and other parts or equipment installed incorrectly.

The fuel injectors get their power from the fuel pump relay. The PCM actuates the relay as the key is turned on. This means, as long as the key is on, the injectors have power.

The PCM activates the injector by supplying the ground at the necessary time and for the proper duration.

Purchase online or from an auto parts store a "direct" injector flushing kit. It will consist of a bottle of high-pressure injector cleaner and a hose with an end for the injector cleaner bottle to thread onto.


Related P02F5 DTC Discussions

Need more help with a P02F5 code?

If you still need help regarding the P02F5 trouble code, please post your question in our FREE car repair forums.

NOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected.