code P02CF=bad fuel???

335stoner · 03-24-2017, 08:44 AM

P02CF Cylinder 2 Fuel Injector Offset Learning at Max Limit

According to this site below I fit maybe dirty fuel???
http://enginedtc.com/p02cf-bmw-formula

My story
I filled up yesterday morning at my normal station and 125 miles later I got the code (SES) car feels fine. got the code and read it when I was driving (at a light) got home and didn't clear it, wanted to see if it would be on when I started the car. it was.. I drove to work to see if it would light would go off and it didn't. when I checked it at work it went from a set code to a history code. so I cleared it out and turned off the car. ill toss in some fuel treatment to help the fuel and see what happens.

I've had the car since November and have driven about 7000 miles. no cbu history..

my fuel economy
29.7- stock
28.3- JBD
28 - JBD + Xhp

I searched and didn't find anything hear with that code.. if it is CBU or injector my extended warranty doesn't cover that, so this will be a job I do if that is bad...

Diesel_Mike · 03-24-2017, 09:21 AM

How many miles on the car?

Any mods other than the JBD?

You might want to block the EGR. A constant SES light is annoying but walnut blasting is a huge pain in the ass...

335stoner · 03-24-2017, 10:58 AM

about 84000

only jbd and xhp

Hoooper · 03-24-2017, 11:34 AM

No CBU history, lower than average mileage before you got it, and injector offset learning limit code...I think most of these cases around here have turned out to be CBU, sorry to say. If it is CBU, clearing the code will make the code go away for a while but it will come back, with increasing frequency.

Torqu3 · 03-24-2017, 01:18 PM

I'm willing to bet it's CBU. Get it cleaned up, and block or delete the EGR. It'll be smooth sailing from then on. CBU cleaning can be a DIY thing as well, if you're willing. Or install a meth kit and let it do the work.

dmanb2b · 03-24-2017, 02:55 PM

Do you hear a noisy injector? I ran into same code a few months ago. If so, run a tank of fuel double dosed with Hot Shots diesel extreme or standyne fuel injector cleaner. I had the same code and the diesel extreme quieted the injectors significantly and code has been gone for 7K miles

335stoner · 03-24-2017, 05:59 PM

That is what I am hoping... I have some juice... i have noticed that it seems a little more "diesely" lately and I think I read that is another sign of cbu.. I'll just start planning to do a cbu and hope that the cleaner will wash out something.. my gut feeling was telling me it wasn't the fuel

Besides a new round of intake gaskets cleaning supplies is that only other thing? Pulling an intake is nothing

Torqu3 · 03-25-2017, 03:44 PM

Quote:

Originally Posted by 335stoner

That is what I am hoping... I have some juice... i have noticed that it seems a little more "diesely" lately and I think I read that is another sign of cbu.. I'll just start planning to do a cbu and hope that the cleaner will wash out something.. my gut feeling was telling me it wasn't the fuel

Besides a new round of intake gaskets cleaning supplies is that only other thing? Pulling an intake is nothing

If you wanted to and it isn't too much trouble, you could pull injectors and check their status. I'd also recommend an EGR block or delete if you don't already have one.

335stoner · 03-28-2017, 07:36 AM

Using INPA????

335stoner · 03-28-2017, 04:21 PM

Maybe 400 miles later ses back on... Looks like I will start with a CBU cleaning sooner than later... Maybe I'll do trans, oil, fuel, and cbu over a planned weekend? Get a fresh start at 85k

Hoooper · 03-28-2017, 06:37 PM

Quote:

Originally Posted by 335stoner

Maybe 400 miles later ses back on... Looks like I will start with a CBU cleaning sooner than later... Maybe I'll do trans, oil, fuel, and cbu over a planned weekend? Get a fresh start at 85k

That would be a pretty aggressive schedule. May be possible if you have a lift, thorough tool selection, a couple helping hands, and have 100% of your supplies ready ahead of time.

335stoner · 03-29-2017, 03:28 PM

ya im not thinking about the time to clean the intake and head... lol

the process in my head sounds like an easy weekend job.. so probably CBU one weekend and save the other stuff for a Saturday the next weekend or so....

Torqu3 · 03-29-2017, 03:53 PM

Quote:

Originally Posted by 335stoner

ya im not thinking about the time to clean the intake and head... lol

the process in my head sounds like an easy weekend job.. so probably CBU one weekend and save the other stuff for a Saturday the next weekend or so....

Yeah, the intake and heads will take awhile. I did all the other stuff in about 6 hours total, and that was taking my time and messing up on numerous occasions. For the transmission pan, be sure you have extra bolts. 1 of mine snapped when I changed the pan.

335stoner · 04-20-2017, 01:47 PM

So just a little update on my situation... my code had been coming back about every 400 miles... I would just reset it and go on since I know I am about to do a CBU. I have been filling up at the same station during this time, but went to a buc-ee's to fill up since it has I high diesel turn over being a "truck stop".

My light has been off since I filled up there... into two tanks now???

I made a large purchase from idparts

fuel filter
oil and filter
trans fluid and filter
intake gaskets

in the comments I asked for a free hat and that request from others has been ignored, but guess what!! not only did they throw in a hat I got a handful of stickers!!! AWESOME

This is my second purchase from them and not only is there shipping fast I have been very happy with my service with them.

ok shout out done!! lol

I have a few odds and ends to get before I clean the CBU, but that is first on my list...

Torqu3 · 04-20-2017, 02:39 PM

Quote:

Originally Posted by 335stoner

So just a little update on my situation... my code had been coming back about every 400 miles... I would just reset it and go on since I know I am about to do a CBU. I have been filling up at the same station during this time, but went to a buc-ee's to fill up since it has I high diesel turn over being a "truck stop".

My light has been off since I filled up there... into two tanks now???

I made a large purchase from idparts

fuel filter
oil and filter
trans fluid and filter
intake gaskets

in the comments I asked for a free hat and that request from others has been ignored, but guess what!! not only did they throw in a hat I got a handful of stickers!!! AWESOME

This is my second purchase from them and not only is there shipping fast I have been very happy with my service with them.

ok shout out done!! lol

I have a few odds and ends to get before I clean the CBU, but that is first on my list...

Did you go for that $150 maintenance pack they have? I'm looking at grabbing one since it's ridiculously cheap for everything you get.

335stoner · 04-21-2017, 06:49 AM

I did not my car came with a new air/cabin filter, so I just got the oil and diesel filter since I can not check the filter without opening it...

It is $1.01 cheaper to get the filter kit and oil change kit... (lol) and since you will get two oil filters it will save you an extra $15.95 (cost of an oil filter)

03-24-2017, 08:44 AM	#1
335stoner BRR tuned 220 Rep 646 Posts Drives: 335D black Join Date: Nov 2016 Location: cypress tx iTrader: (0)	code P02CF=bad fuel??? P02CF Cylinder 2 Fuel Injector Offset Learning at Max Limit According to this site below I fit maybe dirty fuel??? http://enginedtc.com/p02cf-bmw-formula My story I filled up yesterday morning at my normal station and 125 miles later I got the code (SES) car feels fine. got the code and read it when I was driving (at a light) got home and didn't clear it, wanted to see if it would be on when I started the car. it was.. I drove to work to see if it would light would go off and it didn't. when I checked it at work it went from a set code to a history code. so I cleared it out and turned off the car. ill toss in some fuel treatment to help the fuel and see what happens. I've had the car since November and have driven about 7000 miles. no cbu history.. my fuel economy 29.7- stock 28.3- JBD 28 - JBD + Xhp I searched and didn't find anything hear with that code.. if it is CBU or injector my extended warranty doesn't cover that, so this will be a job I do if that is bad...
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03-24-2017, 09:21 AM	#2
Diesel_Mike Enlisted Member 2 Rep 30 Posts Drives: 2011 335D Join Date: Nov 2016 Location: Sea-town iTrader: (0)	How many miles on the car? Any mods other than the JBD? You might want to block the EGR. A constant SES light is annoying but walnut blasting is a huge pain in the ass...
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03-24-2017, 10:58 AM	#3
335stoner BRR tuned 220 Rep 646 Posts Drives: 335D black Join Date: Nov 2016 Location: cypress tx iTrader: (0)	about 84000 only jbd and xhp
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03-24-2017, 11:34 AM	#4
Hoooper Colonel 213 Rep 2,210 Posts Drives: 335D Join Date: Jun 2013 Location: Petaluma, CA iTrader: (0)	No CBU history, lower than average mileage before you got it, and injector offset learning limit code...I think most of these cases around here have turned out to be CBU, sorry to say. If it is CBU, clearing the code will make the code go away for a while but it will come back, with increasing frequency.
	Appreciate 0 Quote

03-24-2017, 01:18 PM	#5
Torqu3 Major 322 Rep 1,157 Posts Drives: 2011 335d Join Date: Sep 2016 Location: Centralish Texas iTrader: (0)	I'm willing to bet it's CBU. Get it cleaned up, and block or delete the EGR. It'll be smooth sailing from then on. CBU cleaning can be a DIY thing as well, if you're willing. Or install a meth kit and let it do the work.
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03-24-2017, 02:55 PM	#6
dmanb2b Banned 2155 Rep 3,360 Posts Drives: G07, F97, F30, E90, E46, E30 Join Date: Jul 2016 Location: NY iTrader: (5)	Do you hear a noisy injector? I ran into same code a few months ago. If so, run a tank of fuel double dosed with Hot Shots diesel extreme or standyne fuel injector cleaner. I had the same code and the diesel extreme quieted the injectors significantly and code has been gone for 7K miles
	Appreciate 0 Quote

03-24-2017, 05:59 PM	#7
335stoner BRR tuned 220 Rep 646 Posts Drives: 335D black Join Date: Nov 2016 Location: cypress tx iTrader: (0)	That is what I am hoping... I have some juice... i have noticed that it seems a little more "diesely" lately and I think I read that is another sign of cbu.. I'll just start planning to do a cbu and hope that the cleaner will wash out something.. my gut feeling was telling me it wasn't the fuel Besides a new round of intake gaskets cleaning supplies is that only other thing? Pulling an intake is nothing
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03-28-2017, 07:36 AM	#9
335stoner BRR tuned 220 Rep 646 Posts Drives: 335D black Join Date: Nov 2016 Location: cypress tx iTrader: (0)	Using INPA????
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03-28-2017, 04:21 PM	#10
335stoner BRR tuned 220 Rep 646 Posts Drives: 335D black Join Date: Nov 2016 Location: cypress tx iTrader: (0)	Maybe 400 miles later ses back on... Looks like I will start with a CBU cleaning sooner than later... Maybe I'll do trans, oil, fuel, and cbu over a planned weekend? Get a fresh start at 85k
	Appreciate 0 Quote

03-29-2017, 03:28 PM	#12
335stoner BRR tuned 220 Rep 646 Posts Drives: 335D black Join Date: Nov 2016 Location: cypress tx iTrader: (0)	ya im not thinking about the time to clean the intake and head... lol the process in my head sounds like an easy weekend job.. so probably CBU one weekend and save the other stuff for a Saturday the next weekend or so....
	Appreciate 0 Quote

04-20-2017, 01:47 PM	#14
335stoner BRR tuned 220 Rep 646 Posts Drives: 335D black Join Date: Nov 2016 Location: cypress tx iTrader: (0)	So just a little update on my situation... my code had been coming back about every 400 miles... I would just reset it and go on since I know I am about to do a CBU. I have been filling up at the same station during this time, but went to a buc-ee's to fill up since it has I high diesel turn over being a "truck stop". My light has been off since I filled up there... into two tanks now??? I made a large purchase from idparts fuel filter oil and filter trans fluid and filter intake gaskets in the comments I asked for a free hat and that request from others has been ignored, but guess what!! not only did they throw in a hat I got a handful of stickers!!! AWESOME This is my second purchase from them and not only is there shipping fast I have been very happy with my service with them. ok shout out done!! lol I have a few odds and ends to get before I clean the CBU, but that is first on my list...
	Appreciate 0 Quote

04-21-2017, 06:49 AM	#16
335stoner BRR tuned 220 Rep 646 Posts Drives: 335D black Join Date: Nov 2016 Location: cypress tx iTrader: (0)	I did not my car came with a new air/cabin filter, so I just got the oil and diesel filter since I can not check the filter without opening it... It is $1.01 cheaper to get the filter kit and oil change kit... (lol) and since you will get two oil filters it will save you an extra $15.95 (cost of an oil filter)
	Appreciate 0 Quote