Ege valve and mas error codes

pablorogue123 · 07-02-2021, 05:34 PM

Hi. I have an E90 320d. Car was struggling for power, codes said egr valve and mass air flow sensor. I've had both of these replaced. Car is running fine now but engine management light is back on and egr valve and mass air flow codes keep coming back even after they are cleared. Any suggestions? thanks

fearitself165 · 07-03-2021, 12:09 PM

Well what exactly are the codes? I'm sure there's more info to be revealed when you analyze both of these engine codes.

Tomnavigator · 08-04-2021, 12:40 AM

I had a problem with my car getting a SES light due to the MAF sensor. I do not remember the code but it was that the MAF was not reading the expected air flow rates. I replaced the MAF with a OEM Bosch MAF and the codes came back within a week or two. The code kept coming back every month or so and I could never resolve the issue. It took me over a year to find out the actual cause. I decided to do a carbon buildup cleaning on the car because the car has 90,000 miles on it. The carbon build up was moderately bad (30% plugged). I cleaned up the carbon buildup with walnut blasting. After the carbon cleaning, I no longer have the occasional MAF sensor code. I think the reduction of the air flow due to the carbon buildup was causing the MAF code. It makes sence that the carbon buildup could cause a restriction in the air flow which caused the SES lights.

CRJ68 · 08-04-2021, 05:11 PM

I had these same codes on my car using a crappy scanner. Generic EGR and MAF codes.

With a better scanner you can get more specific codes and get pointed in the right direction. Most auto parts stores will let you borrow one (Im sure you know) get your hands on their better one and see if it has "BMW Enhanced" mode

07-02-2021, 05:34 PM	#1
pablorogue123 Registered 0 Rep 1 Posts Drives: e90 320d Join Date: Jul 2021 Location: manchester iTrader: (0)	Ege valve and mas error codes Hi. I have an E90 320d. Car was struggling for power, codes said egr valve and mass air flow sensor. I've had both of these replaced. Car is running fine now but engine management light is back on and egr valve and mass air flow codes keep coming back even after they are cleared. Any suggestions? thanks
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07-03-2021, 12:09 PM	#2
fearitself165 Private First Class 4 Rep 154 Posts Drives: BMW 335d Join Date: May 2021 Location: Phoenix, AZ iTrader: (0)	Well what exactly are the codes? I'm sure there's more info to be revealed when you analyze both of these engine codes.
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08-04-2021, 12:40 AM	#3
Tomnavigator Private First Class 82 Rep 189 Posts Drives: 2010 335D, V-10 Touareg Diesel Join Date: Mar 2015 Location: Southwest Louisiana iTrader: (0)	Ege valve and mas error codes possible cause I had a problem with my car getting a SES light due to the MAF sensor. I do not remember the code but it was that the MAF was not reading the expected air flow rates. I replaced the MAF with a OEM Bosch MAF and the codes came back within a week or two. The code kept coming back every month or so and I could never resolve the issue. It took me over a year to find out the actual cause. I decided to do a carbon buildup cleaning on the car because the car has 90,000 miles on it. The carbon build up was moderately bad (30% plugged). I cleaned up the carbon buildup with walnut blasting. After the carbon cleaning, I no longer have the occasional MAF sensor code. I think the reduction of the air flow due to the carbon buildup was causing the MAF code. It makes sence that the carbon buildup could cause a restriction in the air flow which caused the SES lights.
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08-04-2021, 05:11 PM	#4
CRJ68 Enlisted Member 0 Rep 36 Posts Drives: 2011 335D Join Date: Dec 2019 Location: US NW iTrader: (0)	I had these same codes on my car using a crappy scanner. Generic EGR and MAF codes. With a better scanner you can get more specific codes and get pointed in the right direction. Most auto parts stores will let you borrow one (Im sure you know) get your hands on their better one and see if it has "BMW Enhanced" mode
	Appreciate 0 Quote