P026D
Fuel Injection Quantity A Higher Than Expected
Generic OBD-II
Common symptoms
What you'll notice
- Check for any fuel leaks and repair them if necessary
- Inspect and clean the fuel injectors to ensure proper functioning
- Replace the fuel pressure regulator if it is faulty
- Test and replace the oxygen sensor if it is not reading the fuel
- air ratio correctly
- Inspect and clean the Mass Air Flow (MAF) sensor as it can affect fuel injection quantity
Common causes
Most likely first
- Clogged or dirty fuel injectors
- Faulty fuel injector control module
- Malfunctioning fuel pressure regulator
- Air intake system leaks
- Faulty mass air flow (MAF) sensor
How to diagnose & fix
Work through it in order
- Decreased fuel efficiency
- Engine misfire or hesitation
- Rough idle or stalling
- Poor acceleration or lack of power
- Increased exhaust emissions
Read & clear P026D yourself
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