2009 Toyota Rav4 4 Cyl with engine code P0303

Question

I have a 2009 Toyota Rav4 4 Cyl with 107,000 miles with one code P0303. How do I fix this? I've cleared it twice and it has come back at different intervals with the longest being one week.

Answer 1

have you replaced your spark plugs before? at over a 100k miles it should have been replaced. thats is the first thing to replace/check. Also could be a bad coil. 

 

Possible causes

- Faulty spark plug 3
- Clogged or faulty fuel injector 3
- Faulty ignition coil 3
- Fuel injector 3 harness is open or shorted
- Fuel injector 3 circuit poor electrical connection
- Ignition coil 3 harness is open or shorted
- Ignition coil 3 circuit poor electrical connection
- Insufficient cylinder 3 compression
- Incorrect fuel pressure
- Intake air leak

Comments

That's what I did and so far so good. I figured that the spark plugs was, if nothing else, the least expensive way to go. Thanks.

Answer 2

P0303 TOYOTA - Cylinder 3 Misfire Detected

Read more: https://www.autocodes.com/p0303_toyota.html