Misfire Codes P0300 & P0301 2.8L - AudiWorld Forums

A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004
Sponsored by:
Sponsored by:

Misfire Codes P0300 & P0301 2.8L


Old 01-15-2012, 10:03 AM
Audiworld Junior Member
Thread Starter
Join Date: Jan 2012
Posts: 55
Default Misfire Codes P0300 & P0301 2.8L

scanned my car today and got some misfire codes: 2001 a6 2.8 FWD 97k
2 Faults Found:
16684 - Shareware Version. To Decode all DTCs
P0300 - 35-10 - Please Register/Activate - Intermittent
16689 - Shareware Version. To Decode all DTCs
P0305 - 35-10 - Please Register/Activate - Intermittent

ROSS TECH DEFINITION: 16689/P0305/000773 - Cylinder 5 Misfire Detected
16684/P0300/000768 - Random/Multiple Cylinder Misfire Detected

it says something about camshaft position is this timing belt related? i got the belt changed professionally at 89k the car now has almost 97k. if it was timing belt related would it take 8k miles to detect it?

i changed the spark plugs at 75k but the mechanic i got it changed from said the cheap plugs would be OK to use so he bought some cheap copper ngks single tips i believe. i havent been back to that mechanic after he changed the plugs and did not get my belts replaced by him.

the car runs like normal no loss of power no check engine lights. i just scan my car every week to see.

last month i had 16825/P0441/001089 - EVAP Emission Control Sys: Incorrect Flow
but i cleaned the purge valve and lots of black crud came out and the code went away.

i also had the code (last month) 16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold
but i was low on oil so i thought since i park on a steep hill the oil went into the cats and blocked the holes. so i started parking it in my garage and after a long drive the code was gone (and used some stp fuel injector cleaner) AND i had the oil was only 2k old and i changed it my self and made sure it was full multiple times but it became low and i had to add about 700ML. the oil could not have been lost from leaks because i had my leaks fixed.

i wrote my old fault codes so maybe someone can make a connection (if any?)

ALSO since the code was intermittent is it OK to drive the car? i drive the car to work which is 5 miles away and 5 miles back. ill be using my 2.7 for long trips for now.

ALSO noticed when i started the car from cold the rpms were bouncing around 100rpms for a couple of seconds and then normal. i read a thread that a guy fixed his P0300 by replacing the oxygen sensor. this doesnt seem like it would help to me what do yall think?
2.7taudi is offline  
Reply With Quote
Old 01-15-2012, 03:02 PM
Audiworld Junior Member
Thread Starter
Join Date: Jan 2012
Posts: 55

update: from this morning i drove the car 40 miles and i just now scanned it again and no fault codes were found. does this mean the ecu just tripped a code?

so in cylinder 5 the misfire i had i can rule out the timing belt issue or it would have caused the whole bank to misfire i think. if the code comes back im thinking its probably a bad spark plug or the wire from the distributor cap to the plug (coil pack?) or maybe a dirty injector.

But what does the p0300 mean? does it mean all the cylinders are misfiring? if it does why would it just specify cylinder one and not the others?

i could use any help. car is at 97k and this is the 1st misfire.
2.7taudi is offline  
Reply With Quote

Related Topics
Thread Starter
Last Post
A4 (B5 Platform) Discussion
01-10-2017 08:11 AM
Audi A5 / S5 / RS5 Coupe & Cabrio (B8)
07-04-2016 09:51 AM
S4 (B8 Platform) Discussion
01-04-2016 01:28 PM
A6 (C7 Platform) Discussion
09-16-2015 01:09 AM
A4 (B5 Platform) Discussion
09-10-2015 02:02 PM

Thread Tools
Search this Thread
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -8. The time now is 05:09 PM.

  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: