Check engine light still on after problem fixed

A flashing check engine light often occurs due to misfires.

The P0420 is probably caused the misfires. Flashing check engine light is a serious condition that can destroy the catalytic converter if not fixed. Do not keep driving it like this. Get it to a shop to have it fixed.

You have bad coil,need scanner will tell you which one.

To confirm the exact fault,the error code stored in engine computer module has to be retrieved.
But as why check engine light came up,for that issue there are few help link with solutions to correct the issue.========
Click the link below:---
After getting car washed, check engine light is ON and key less entry not working, tried reprogramming. Also car shows fuel pressure? http://schematicsdiagram.blogspot.com/2011/12/after-getting-car-washedcheck-engine.html
------------How to Read Codes from Check Engine Light? http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
------------Check Engine Light Reset Procedure? http://whoisbyme.blogspot.in/2012/06/check-engine-light-reset-procedure.html
------------- Check Engine Light ON? http://whoisbyme.blogspot.in/2012/06/check-engine-light-on.html
----------- Intermittent Check Engine Light? http://whoisbyme.blogspot.in/2012/06/intermittent-check-engine-light.html
---------- Service engine soon Light Turned OFF after Jump Start? http://whatisbyme.blogspot.in/2012/06/service-engine-soon-light-turned-off.html
---------- 2005 Chevy Impala: Service Vehicle Soon Warning Light? http://whoisbyme.blogspot.in/2012/06/2005-chevy-impala-service-vehicle-soon.html
--------- Malfunction Indicator Light ON http://whoisbyme.blogspot.in/2012/06/malfunction-indicator-light-on.html
--------- Car jerks while going uphill and Check engine light is ON?

http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html

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Toyota Camry Check engine light flashes while driving? http://schematicsdiagram.blogspot.in/2012/02/toyota-camry-check-engine-light-flashes.html
----------1999 Toyota Tacoma: Check Engine Light Read Code P0171?

http://whatisbyme.blogspot.in/2012/05/1999-toyota-tacoma-check-engine-light.html
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2007 Toyota Highlander Hybrid: Yellow Check Engine Light ON dash? http://whatisbyme.blogspot.in/2012/05/2007-toyota-highlander-hybrid-yellow.html

--------Check engine light with codes P2195 and P2197? http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
---------Car Runs Fine But Check Engine light is ON? http://whatisbyme.blogspot.in/2012/05/car-runs-fine-but-check-engine-light-is.html
----------After replacing throttle body the Check engine light starts blinking? http://technoanswers.blogspot.com/2012/01/after-replacing-throttle-body-check.html
---------OBD Code is cleared but check engine light will not RESET? http://schematicsdiagram.blogspot.in/2012/02/obd-code-is-cleared-but-check-engine.html
--------These will help.Thanks.

When the check engine light is flashing it means that the computer has detected a misfire in the engine.It is not good to drive a vehicle that has a flashing check engine light; one or more sensor in your vehicle is advise about an code fault. I suggest scanning for know what code is in there and solve it.

In some vehicles, a red check-engine light means the car needs absolute immediate attention while a yellow check-engine light means you need to make an appointment soon. The light is used to indicate PCM (Powertrain Control Module) problems that are associated with your vehicle's emissions system.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

When the check engine light is flashing it means that the computer has detected a misfire in the engine.It is not good to drive a vehicle that has a flashing check engine light; one or more sensor in your vehicle is advise about an code fault. I suggest scanning for know what code is in there and solve it.

In some vehicles, a red check-engine light means the car needs absolute immediate attention while a yellow check-engine light means you need to make an appointment soon. The light is used to indicate PCM (Powertrain Control Module) problems that are associated with your vehicle's emissions system.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

Go to your local O'Rielly's or Autozone. They will tell you the code and reset it for free. Otherwise take the negative battery cable loose for about 10 min. This will clear the ECM, but you won't know what tripped the light! Best Wishes, TJ

Pull the vac hose going to fuel pressure regulator and see if it has fuel in it. If it does replace it. Just fixed one with multiple misfire codes.

When the CHECK ENGINE light turn ON, one sensor in your vehicle is advise about an code fault. i suggest scanning for know what code is in there and solve it.

Good luck.

Pull the code(s) at the moment the Check Engine light is flashing. Purchase an OBDII scanner (Auto Zone, Car Quest, O'Riely's, etc.) Be ready when it happens... do not shut off the engine ... plug the OBDII scanned into the DLC (Data Link Connector) and retrieve the code(s) at the moment it happens. If you still don't retrieve any codes when this happens, you have a malfunctioning ECM (Engine Control Module). Before you replace it (if this actually happens - no codes and Check Engine light is flashing), Disconnect both battery cables and touch them together for 30 seconds. Reconnect them to the battery and drive vehicle to see if it happens again (could be junk/corruption in ECM memory banks). If it happens again, the ECM is malfunctioning. REASONING: Whenever the "Check Engine" light comes on, there is ALWAYS a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). If no codes are retrieved, there's only one cause - ECM MALFUNCTION!