P0300, P0301, P0303 Codes 2014 Toyota Corolla S+

5

Asked by James Dec 09, 2023 at 12:25 PM about the 2014 Toyota Corolla S Plus

Question type: Maintenance & Repair

I've replaced Spark Plugs, Coil Packs, battery, air filter, and all 4 injectors over
the past few months and still getting misfires. Please help!

6 Answers

307,255

Maybe fuel or exhaust flow related, did you run a fuel pressure/flow test and a exhaust back pressure test

5

I don't have the tools for a proper fuel pressure test, but there's fuel in the rail and it has pressure. I don't know how to check the exhaust pressure.

307,255

A fuel pressure tester can be purchased but good one are expensive. A DIY back pressure tester is fairly cheap from most any parts store.

5

So fuel flow means fuel filter and/or pump. But what's the fix if there's something wrong with the exhaust?

155,245

Compression test cylinders 1 and 3. If they're next to each other I'd suspect a head gasket blown between the two cylinders. The compression test will tell us. Hope that helps! Jim

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