A
Anonymous
Guest
Lol cheers I will have a look into this
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Sent from my iPhone using Tapatalk
Exhaust emission light. Forum to the rescue.UPDATE
- Thread starter Ross D
- Start date
Just a note - Fault codes don't normally come on for no reason, although it could be a faulty sensor.
The engine warning light came on and I read the codes and it was Bank 1 and 2 too lean. Had a look around the engine and couldn't spot anything, and too lean could be caused by a number of things. So cleared it and it came on a few more times over the period of a few weeks. No noticeable performance issues.
Had another look around the engine bay and noticed that one of the hoses on the air intake system, downstream of the MAF is split in half, hence sucking in unmetered air and causing it to run lean. Now, dirty air entering the clean side isn't great
Ordered the part and changing it this weekend.
I would do a bit of reading around and try and solve the problem rather than keep clearing the codes, especially if it keeps coming back.
The engine warning light came on and I read the codes and it was Bank 1 and 2 too lean. Had a look around the engine and couldn't spot anything, and too lean could be caused by a number of things. So cleared it and it came on a few more times over the period of a few weeks. No noticeable performance issues.
Had another look around the engine bay and noticed that one of the hoses on the air intake system, downstream of the MAF is split in half, hence sucking in unmetered air and causing it to run lean. Now, dirty air entering the clean side isn't great
Ordered the part and changing it this weekend.
I would do a bit of reading around and try and solve the problem rather than keep clearing the codes, especially if it keeps coming back.
Quick update. Th emission light came on again and code read P1170. I couldnt find this anywhere and today took the car to the dealers. I have received a call saying that it is the exhaust manifold 
They also said that they had spoken to BMW and would have to source the manifold as it doesnt appear to be available off the shelf. The one silver lining is that the car has an AUC warrenty so the work will be covered and the dealer has organised a courtesy car until the repairs are carried out. For me the lesson is do not just delete error codes and think it will all be ok 
They also said that they had spoken to BMW and would have to source the manifold as it doesnt appear to be available off the shelf. The one silver lining is that the car has an AUC warrenty so the work will be covered and the dealer has organised a courtesy car until the repairs are carried out. For me the lesson is do not just delete error codes and think it will all be ok 
Put a stubby on it while they're not looking! Quick!
a340driver
Member
Surely if there's a fault light, then there's an issue. Just blindly cancelling it is a bit daft. I'm wondering if people buy these to sell their car....
I don't have a fault code reader...! Although in the winter if I am not careful on the first overrun or two from a cold cold start the engine warning light does come on.
However, without fail, after 5 more cycles, the light goes out all by itself....magic that
I don't change fuels or anything, so I just think the engine runs too rich or something which upsets an O2 sensor from those cold starts!
Thinking about decat-ing the secondary cats though - we'll see what that does to the warning lights!!!! :evil:
However, without fail, after 5 more cycles, the light goes out all by itself....magic that
I don't change fuels or anything, so I just think the engine runs too rich or something which upsets an O2 sensor from those cold starts!
Thinking about decat-ing the secondary cats though - we'll see what that does to the warning lights!!!! :evil:
miln0039 said:I don't have a fault code reader...! Although in the winter if I am not careful on the first overrun or two from a cold cold start the engine warning light does come on.
However, without fail, after 5 more cycles, the light goes out all by itself....magic that
I don't change fuels or anything, so I just think the engine runs too rich or something which upsets an O2 sensor from those cold starts!
Thinking about decat-ing the secondary cats though - we'll see what that does to the warning lights!!!! :evil:
And mine does exactly that too.
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a340driver
Member
Grizzly9 said:
Sensors are by their nature simple things. So, yes if there is no problem, replace the sensor having confirmed that it's faulty. Just resetting the fault code isn't really addressing the fault, sensor or otherwise.
rangerx292
Member
Hi guys,
Sorry to resurrect this post but I have the same issue. After putting a full tank of Sainsburys the check engine light came on after about 30 miles driving. Scan code given is P0139 but the car drives fine. Should I just clear the code and try refueling again ?
I was going to check the post cat o2 sensor.
Sorry to resurrect this post but I have the same issue. After putting a full tank of Sainsburys the check engine light came on after about 30 miles driving. Scan code given is P0139 but the car drives fine. Should I just clear the code and try refueling again ?
I was going to check the post cat o2 sensor.
North West Surrey
6 months after I got my current Z4 I had an Amber EML appear.
Took it to my Indy and the fault codes were for post-Cat sensors on both banks, but while he was doing diagnostics the battery died. :roll:
So if you don't know the age of your battery it might be worth getting it's condition checked as these cars seem to throw random electrical faults when the battery is on it's way out.
Took it to my Indy and the fault codes were for post-Cat sensors on both banks, but while he was doing diagnostics the battery died. :roll:
So if you don't know the age of your battery it might be worth getting it's condition checked as these cars seem to throw random electrical faults when the battery is on it's way out.