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Usually caused by:

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

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

 More common on direct-injection engines:

• P0087 – Fuel rail pressure too low 
• P0088 – Fuel rail pressure too high

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