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 1,000 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
  1. Home
  2. Questions
  3. 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: recomended work when replacing whaterpump in a 2007 bnw 530i

If the water pump is the only part that has failed, it is only necessary to replace the water pump itself. However it is not a bad idea to go ahead and replace the serpentine belt when replacing the water...

Q: Battery drainage

This sounds like potentially a short somewhere in your electrical system perhaps with an accessory or some component that is draining the battery while the car is not running. I would start testing accessories like electrical outlets, etc. to see...

Q: OBD-II failed for smog check

Unfortunately without more information as to why your Toyota Corolla did not pass the emissions test, it is difficult to determine the cause for the failed smog check. Provided that the ODB2 port itself has power and is allowing the...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.