Question about 2004 Audi A4

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While driving the car started to miss badly, the check engine light came on then began to flash. checked for codes, engine missfire was the only stored code. owners man. said cat. problem ?

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It's not a cat problem or you'd have misfires on all cylinders. P0300 is random misfires, and the codes increment to show what cylinder is misfiring. P0301 is a misfire on cylinder 1, P0302 is cylinder 2, etc. You likely have a bad coilpack. Whichever cylinder is indicated, replace that coilpack.

Posted on Jul 04, 2011

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Sounds normal when you have a cylinder miss.
The flashing light means the problem is serious.
You would have the computer scanned for trouble codes then research the codes. You should get a code telling you which cylinder is not providing power and you check the ignition and fuel injector for that cylinder or cylinders.

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My 99 es300 has 240k on it and has been an amazing workhorse for me. it began jerking around today, and felt like an 02 sensor gone bad, it threw codes p0300b p0302 p0303 running real rough and...


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Began running rough at start up and would correct itself after a bit. Now runnung rough all the time. Check engine light has now come on, but doesn't stay on continuously.


If the check engine light goes on for any length of time, there probably are codes stored in the computer that can give you clues as to what is wrong with the electronic engine controls, or mechanical parts on the engine.
Reading Codes 1985–94 vehicles Codes are displayed by the MIL flashing ON and OFF. The time duration of the flash identifies the significance of the digit. Three flash durations are used:
  • A flash duration of 0.5 seconds indicates no malfunction (OK).
  • A flash duration of 1.3 seconds indicates that it is a 10's digit.
  • A flash duration of 0.2 seconds indicates that it is a 1's digit.
For example, if 3 flashes — 1.3 seconds long — are followed by 4 flashes — 0.2 seconds long — a Code 34 is indicated. These code sequences are separated by 1.8 seconds to avoid confusing tens and ones digits.
  • Read Memory Mode: used to pull codes which have been stored in memory. It is most effective in detecting poor contact of wiring harness connectors. To enter this mode, connect the read memory connector with the ignition ON.
  • D Mode: used to diagnose and test the entire injection system. To enter this mode connect the test mode connector with the ignition ON. On the Legacy and SVX, the ignition must be ON with the engine running.
  • F-Check Mode: used to measure the performance characteristics of the injection system components. When working in this mode, a Select Monitor or equivalent scan tool is required.
  • U Check Mode: operates during normal engine operation. It signals the driver using the MIL only when components necessary for start-up and drive are faulty. The read memory and test connectors must be disconnected with the ignition ON for this mode to be operational.
Clearing Codes 1985–94 vehicles With the ignition ON and the engine running, connect both the read memory terminal and the test mode terminal

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My "Check Engine" light is flashing! 96 Dodge Intp 128,000 miles. Just got it back from $1,500.00 worth of repairs.


flashing light means a severe missfire and emminent cat converter failure.
in other words it has a bad missfire

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An EVAP code is emissions and should not harm the engine. A flashing check engine light is a bad thing. When it is flashing it is telling you it has a missfire bad enough to damage the catylist, converter or engine. I would worry about that more than any EVAP code. Good Luck

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