Skip the auto shop - Our mechanics make house calls

Q: Check Engine Light trouble code P0302. I changed the coil and switched plugs. This 2007 Corolla only has 26,000 miles. Is there an easy solution?

asked by on

Engine light on mechanic checked code p0302 Changed coil for cylinder 2 changed plugs. light still comes on . Engine not running really ruff. Any suggestions

My car has 26400 miles.
My car has an automatic transmission.

Diagnostic Trouble Code P0302 is not necessarily caused by a bad coil or spark plug. Unless the coil was actually tested, it could very well be perfectly good. Diagnostic Trouble Codes do not conclusively identify faulty parts. The only way that a part, referred to in a code description, can be condemned is either through direct testing of the part (per Factory Service Manual procedures) or, in some cases where the part cannot be completely and reliably tested, using a process of elimination.

With regard to DTC P0302, the cause of that code setting could be: lack of compression in cylinder 2, defective fuel injector, clogged EGR valves or tubes, burned valves, ignition timing that is inaccurate, vacuum leaks, low fuel or low fuel pressure, leaking head gasket, bad camshaft sensor, bad crankshaft sensor, bad mass air flow sensor, bad oxygen sensor, bad throttle position sensor, bad catalytic converter, and bad powertrain control module (rare, exceptional). There are other causes as well.

A point is the situation has to be diagnosed and no parts should be replaced unless it is certain and proven that they are actually defective. If you wish to schedule a Check Engine Light diagnostic with a certified YourMechanic specialist please follow up and the mechanic will identify the root cause of the trouble code at your own location.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • Check Engine Light trouble code P0302. I changed the coil and switched plugs. This 2007 Corolla only has 26,000 miles. Is there an easy solution?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car completely died with all symptoms of bad altenator while it was raining next day starts right up what could that be?

Hello and thank you for writing in. With the multi symptoms that you are experiencing with your vehicle, there are a couple things that are wrong. The first thing is the ignition switch probably failing. All of your power devices...

Q: My car starts but will not stay running at idle.

You may have a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. Since...

Q: How do I use the tether strap anchor brackets?

All three rear seats have tether strap anchor brackets behind the head restraint, to accommodate certain child restraint systems, and improve rear seat safety. To use these anchor brackets, run the child restraint system’s tether strap over the seat back,...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.