I have recently encountered some problems with my girlfriends A2 1.6FSi that I'm hoping someone on here may be able to help me with...
Some time ago (2 months) the engine managment light came on when my girlfriend was driving and this corresponded with a loss of power. She drove someway home and upon examination I suspected an ignition fault, possibly a ingnition coil. Sure enough upon examination of the plugs I found No 2 to be sooty and wet, as opposed to the other three which were OK. I replaced the coil and all is now fine and the light has extinguished itself a couple of days later. I did have a slight concern that the unburnt fuel as a result of the missfire may have damaged the Lambda probe or cat, but all seems well until now.
Bringing you all up to date...
Firstly the engine managment light came on again so i read the fault codes (with VAG-COM) and recieved the following...
VAG-COM Version: Release 409.1-US
Control Module Part Number: 036 906 013 F
Component and/or Version: MED7.5.11 4628
Software Coding: 00051
Work Shop Code: WSC 02138
Additional Info: WAUZZZ8Z33N015908 AUZ7Z0B2206656
2 Fault Found:
17446 - Heating Circuit for Nox Sensor: Open
P1038 - 35-00 - -
17700 This code did not have a description.
The car still runs fine but I plan to investigate this further..
More recently the EPC light illuminated along with the still illuminated engine managment light. There is no accompanying loss of power as stated in the owners manual. Upon reading the fault codes the following code has been added to the above...
16955 Cruise/Brake Switch (A) Circ Malfunction
Firstly, I have read the other thread in the NOx sensor problem and before I start replacing parts I would like to investigate this further. Does anyone have a resistance value for the NOx sensor heater element? If I can check this and it is OK then that takes the sensor out of the problem.
Secondly, does anyone know what the code 17700 indicates (I have searched the web to no avail)?
Finally, Given that the brake lights are working fine, does anyone have any theories on the brake circuit fault?
If anyone can offer any ideas I would greatly appreciate it.
Thanks for looking and sorry for being so long winded.