BMW Forums : BimmerForums banner

1 - 5 of 5 Posts

·
Registered
Joined
·
68 Posts
Discussion Starter #1
Hi all,

Over the last few days I noticed the revs at idle we fluctuating ever so slightly then normal and the car feeling a little rough. I used the Torque OBD diagnostic tool via my phone to scan for any codes and it showed two pending codes - P0170 Fuel Trim (Bank 1) and P0173 (Fuel Trim Malfunction (Bank 2), however the engine light did not appear on.

Today the engine light came on after about 10 minutes of driving. I tested again for fault codes and the codes mentioned above appeared as permanent faults. After parking up at work, I used the Torque OBD to check the car's Raw Data Display from the ECU. I've attached some screenshots of the data. Would anyone be able to tell me if anything looks untoward, especially with the MAF, F/T 1x1, F/T 2x1, 02 1x1, 02 2x1 or any other figures? All these figures are from the car being at idle.

Before taking it to my local BMW mechanic, I was thinking of cleaning the MAF sensor, cleaning the Secondary Air Pump Valve and checking for any vacuum leaks to my best abilities. Does anyone know if this might clear the codes?


Would really appreciate your help with this


Thanks


screenshot-1[1].jpg screenshot[1].jpg screenshot-2[1].jpg
 

·
Registered
Joined
·
6 Posts
Hi - what type of fuel are you using? I had an E46 330Ci and whenever I put cheap supermarket petrol in it, I got the engine warning light. I think it was due to the higher content of ethanol in the fuel causing problems. I changed petrol station and never had the problem again.
 

·
Registered
Joined
·
68 Posts
Discussion Starter #3
Hi - what type of fuel are you using? I had an E46 330Ci and whenever I put cheap supermarket petrol in it, I got the engine warning light. I think it was due to the higher content of ethanol in the fuel causing problems. I changed petrol station and never had the problem again.
Hi, I tend to use Sainsbury's supermarket Unleaded petrol. Never had any issue with it before but there could always be a first
 

·
Registered
Joined
·
608 Posts
As BMW325TI said. Check the intake hoses from the MAF and down to the engine. While the old hoses are off, clean the throttle body and the Idle Control Valve with carbon cleaner.
 
1 - 5 of 5 Posts
Top