Question about 2001 Audi A4

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2001 audi a4 1.8 random misfire

My car has a random misfire code p0300,p0301,p0303,p0304.i have change all spark plugs ,coils and my CEL keeps on coming back on .strange thing is it comes on when my car is hot like after i drive it for 20 mins on the road then CEL flashes then runs rough no power,,then CEL goes solid then car drives good ...then after CEL lights goes off. i really need some help

Posted by badben360 on

  • 3 more comments 
  • badben360 May 25, 2009

    u think a bad plug wire will do this ? really weired comes on goes off.

  • badben360 May 25, 2009

    i'll call audi tomorrow for it and give it a shot...thank u keep updated

  • badben360 May 25, 2009

    Did u mean my ECM ,,,,i had ECM change last year in NOV/08

  • Dar
    Dar May 11, 2010

    They sure will.

  • Dar
    Dar May 11, 2010

    You haven't changed plug wires? Maybe try that.

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Anonymous

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Do a compression test then do a combustion pressure test if all good computer is questionable

Posted on May 25, 2009

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Have you changed the coils at each misfing cylinder? I had a misfire on cylinder 3, running really rough with flashing check engine light when engine was warm. The Check Engine light did come on solid after the misfire cleared. Swapped the coil with another cylinder and the misfire code followed the coil, so I replaced the suspect coil with a known good one. Voila, problem solved. My vehicle is a 2001 Jetta 1.8t, and from what I've read on the internet, failing coils is a very common problem. Good luck.

Posted on Jun 25, 2009

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1 Answer

My car had engine codes p0300 and p0301 so I changed my spark plugs and my coil 1 now I have codes p0301 & p0304 and I don't know why any help would be greatly appreciated thanks


P0300 is random misfires. Meaning more than one cylinder was misfiring. Year make model and engine size helps. On 4 cylinders 1 and 4 fire at the same time, this would be an ignition module. On a lot of models.

Apr 01, 2016 | Cars & Trucks

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97 chevy tahoe running rough update....


code P0303 is a misfire code for cylinder # 3, Possible spark plug, wire/coil or injector problem. P0141, bank1 sensor2, is the upstream oxygen sensor, this code may have been set by the misfire of Cyl #3, the lean condition is being cause by the misfire. Fix the misfire and clear the codes and P0141 should not return. If the vehicle is equipped with Coil over plug system try swapping the coil with any one of the others, test drive and if the misfire code changes to another P0300 code ( P0301, P0302, P0304 etc...) the coil has failed and will need to be replaced.

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Engine shaking while accelerating


check engine light on, code P0300 P0301 P0302 P0303 P0304 THIS ARE ALL MISFIRES, 300 is random, 301 cylinder one 302 cylinder 2 and so on, the evaluation is once apart check the spark plugs condition, if they look ok, replace coils and plugs. if the light is not on, verify it works by turning the ignition to pos 2, if not replace light, if yes, and this here are not the codes, read the codes and re send it, posible bad cylinders, or poor injector.

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Change...distributor cap ..spark plug wires or spark plugs

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2002 elantra cyl 2 random misfire


Hi there:A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

For example, a P0302 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #2; same condition in P0301 - cyl #1, P0303 - cyl #3 and P0304 - cyl #4.

A code P0300 (or 301, 302, 303 or 304) may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer

About your possible solutions, if there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.


Hope this helps.

Mar 09, 2012 | Hyundai Motor 2002 Elantra

1 Answer

06 c230 sports mercedes code p0300, p0301, p0304


I think this is a Coil problem. try replacing coil. If not, it is a MAF problem. 06 wire should still be fine now.

Feb 15, 2012 | Mercedes-Benz C230 Cars & Trucks

2 Answers

I failed the emission test and I also went to get an check engine light test from Auto Zone. I received the codes P0300, P0301, P0302, P0303, P0304 and the results that I received from Auto Zone was valve...


A code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Hope helps.

Apr 19, 2011 | Lexus GS 400 Cars & Trucks

1 Answer

2003 mercedes Benz C240 codes P0300, P0301, P0302 and P0303. Please, help me how to fix?.


P0300 Random Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
according to this fault codes first mark ignition coils
3 ---------------- 6
2 ---------------- 5
1 ---------------- 4
RB-------------LB
this right banks and left bank, please remove Ignition coils with lids and spark plugs from right bank and swap with left bank, if fault code change as
P 0304 Cylinder 4 Misfire Detected
P 0305 Cylinder 5 Misfire Detected
P 0306 Cylinder 6 Misfire Detected
You can Identify it's a faulty ignition system then next swap ignition lids from ignition coils be careful each coils have two lids one short and other long bit deference and when you remove and fix it to the car keep in mind correct order because each coil two different fire for two spark plugs don't mix up, if you mix it can create the fault code.if you detect any fault ignition coils or spark plugs or lids replace that and also whether god or bad recommend to replace spark plugs, find the right that's most important thing, if this way couldn't found the any ignition fault next step is check fuel presser, when the engine running fuel presser must be around 4.5 bar without engine running must be 4 to 6 bar if the fuel presser too low need to check two different things one is fuel pump other is fuel injectors, in this case you can swap injectors from right bank to left bank and find is the injectors leaking, if not leaking faulty fuel pump.is this information helped you? if yes please leave a comment,

Oct 15, 2010 | 2007 Mercedes-Benz C230 Sedan

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