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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 09-04-2016, 03:05 PM   #1
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Join Date: Oct 2015
Location: New York City
Posts: 102
My Ride: 2001 BMW E46 M3 6MT
Service Engine Soon P0300 P0303 P0304 P0306 Misfire/Misfiring

Ok guys so forgive me for making a lengthy thread that is already out there but I got a Service Engine Soon Light today and used my friends cheap $40 code reader (bought on amazon) and recieved these codes:


Now, I have done research but all I see is people mentioning their CEL light coming on. I think this is the same light but I tried to research that but had no luck.

1.So first question, is CEL the Service Engine Soon Light?

Background: 2001 M3 Coupe 128k spark plugs replaced about 200 miles ago. No previouse record of any changing of spark plugs/coils (i changed spark plugs to prevent any problems and bring the car up to maintenance)

So the other night i came home really late and the range on the car said 8 miles left on the tank when i parked. I decided i would pump gas the next time i drove (gas station 2-3 blocks away). Today i turn on my car and everything is well. I begin the journey to the gas station and after about 2 block i feel the car start to lose power. I then get the Service Engine Soon Light. I got to the gas station filled the tank half way. turned the key to position 2 and back to off about 6 times. (I've read in other forums it "primes the fuel tank") I then began to drive and noticed the lost of power still was there (the car would hesitate in 2nd gear when i gave more than 30% throttle and i would almost stall out on hills) I made it to my friend who had a cheap code reader which spit out the codes above.

2. Was this all due to me leaving the car extremely low on gas?
3. I am going to a shop friday, but what are ALL the possible reasons this happened?
4. I read its a simple fix by getting new coils. Should i buy new sparkplugs if it does in fact end up being the coils? (i have about 200 miles on them, NGK Mfg DCPR8EKP-6 https://www.ecstuning.com/ES11069/ )
6. Do you think me changing the spark plugs and not the coils is the reason this happened?

Please guys don't make fun of me. Help to the best of your ability, it is greatly appreciated. Forgive any grammatical or spelling errors. Thanks!

Last edited by bradleyhenry94; 09-04-2016 at 03:06 PM.
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Old 09-05-2016, 12:12 AM   #2
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Join Date: Jul 2015
Posts: 35
I would reset the codes first and see if they come back before spending money. From my experience with the car and on forums cylinder misfires are pretty common and may not even throw a light. Yes cel is the same service engine soon. Lastly, get the codes read by something that can give more details or is specific to BMW's. This could give some valuable insight to your problem. My guess is there is something wrong besides just misfires.
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Old 09-05-2016, 09:40 AM   #3
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Join Date: Oct 2015
Location: New York City
Posts: 102
My Ride: 2001 BMW E46 M3 6MT
That is why I am going to a shop on friday. I forgot to mention that my friend reset the code when reading them and after about 200 feet the CEL came back on. Thanks for the insight
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Old 09-05-2016, 11:18 PM   #4
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Join Date: Mar 2009
Location: Denver
Posts: 58
My Ride: 2003 M3 Convertible
Service Engine Soon P0300 P0303 P0304 P0306 Misfire/Misfiring

Sounds like coils to me. A BMW code reader will tell you exactly which coil is out. No spark plug replacement needed. Recommendation is to replace all coils but if money is tight only the bad coils can be replaced. It's about 65 dollars per coil.

2003 BMW M3 Convertible:
BBS LM's 19"
Stop Stech 355mm Slotted Big Brake Kit
6 pistons in front and 4 Piston on Back
CSL front bumper
Vorsteiner VCSL rear diffuser full carbon fiber
Crystal LED Tail lights upgrade
Matte Black front grill and side gill upgrade
Short Antenna
Agency Power Exhaust with Titanium Tips
Bilstein PSS10 Coilover System
Radio Upgrade
Interior refreshed
DICE Ipod Integration
Hardwired for a Valentine V1

Last edited by cosantana; 09-05-2016 at 11:19 PM.
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Old 09-09-2016, 11:55 AM   #5
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Join Date: Oct 2015
Location: New York City
Posts: 102
My Ride: 2001 BMW E46 M3 6MT
UPDATE: I went to a shop today and he tested the coils. Apparently #4 wasn't working. Replaced that one out. Good so far *FINGERS CROSSED*
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Old 09-10-2016, 08:30 AM   #6
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Join Date: Sep 2012
Location: forest hill, md
Posts: 1,357
My Ride: 2002 m3 convertible
Thanks for updating us. I hate when ppl find a solution or fix and they dont post it
Cayne23 is offline   Reply With Quote

misfire, p0300, p0303, p0304, p0306

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