ERROR CODES

These error codes may be caused by factors OTHER THAN FUEL INJECTOR ISSUE

Usually caused by:

• Bad injector coil
• 👉Broken wiring
• 👉Poor connector contact
• 👉ECU driver issue 

NON fuel injector error under the same codes:

Air/Vacuum Issues

👉 Vacuum leaks (hoses, intake boot, intake gasket)
👉 PCV valve stuck open
👉 Brake booster vacuum leak
👉 Intake manifold cracks
👉 EVAP purge valve stuck open
 

Happens when an injector is clogged, leaking, or not firing:

• P0300 – Random/multiple cylinder misfire
• P0301 – P0308 – Misfire on specific cylinder
   

👉Could also be spark plugs or coils, but injectors are a very common cause.

Injectors not delivering proper fuel amount:

• P0171 – System too lean (Bank 1)
• P0172 – System too rich (Bank 1) 
• P0174 – System too lean (Bank 2)
• P0175 – System too rich (Bank 2)
   

👉 Causes:

• Clogged injector → lean
• Leaking injector → rich

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This code means the ECU sees a rapid, abnormal drop in fuel pressure that looks like fuel is escaping the system. 

The engine control module (ECM) has detected abnormal electrical behavior or performance in one or more fuel injectors. This may involve:

• Low or high voltage in the injector control circuit
• Incorrect injector response time
• Fuel delivery outside expected limits