2001 A6 2.7T Stumbles on Acceleration
#1
06-01-2009, 02:35 PM
2001 A6 2.7T Stumbles on Acceleration
2001 Audi A6 2.7T 6-Speed
Engine stumbles when trying to accelerate and surges at idle. Pulled the codes and came up with:
P1113 Bank 1, Sensor 1- Internal Resistance to high - Check Oxygen Sensor
P0431 Warm up catalyst Bank 2 Efficiency below threshold Check warm Up Catalytic converter Bank 1
P0103 - Mass Air Flow Circuit High Input Check Mass Air Flow Sensor
I unplugged the MAF sensor and the car runs and idles fine. So I replace the MAF and the rebuilt sensor gives me the same driving conditions.
Help! I dont want to keep replacing parts until I find out what actually is wrong.
Engine stumbles when trying to accelerate and surges at idle. Pulled the codes and came up with:
P1113 Bank 1, Sensor 1- Internal Resistance to high - Check Oxygen Sensor
P0431 Warm up catalyst Bank 2 Efficiency below threshold Check warm Up Catalytic converter Bank 1
P0103 - Mass Air Flow Circuit High Input Check Mass Air Flow Sensor
I unplugged the MAF sensor and the car runs and idles fine. So I replace the MAF and the rebuilt sensor gives me the same driving conditions.
Help! I dont want to keep replacing parts until I find out what actually is wrong.
#2
06-07-2009, 10:16 PM
Issue Solved
Using the information from various Audi forums and the attached TSB (Technical Service Bulletin), I found the problem to be a hose was not attached between the driver side Turbo and the Intercooler. A quick trip to the Auto parts store and installing a $1.00 hose clamp fixed the problem. After unhooking the battery to clear the codes I have no Check Engine light and the ABS and Traction Control lights are also off after a couple of days of driving.
I read that if you have an engine control fault the ABS and Traction Control turn off because when the traction control turns on it also uses the engine control to reduce power.
As a note unhooking the MAF sensor did make the car drivable in a limp home mode. I would not run the car like that but in a pinch you could drive it for a short distance.
PS-The TSB Bulletin # 010207 is too large to attach. Here is the intro. Hopefully you can find it online.
Group: 01
Number: 02-07
Date: Sept. 30, 2002
Subject:
Diagnosis of Driveability Complaints on Turbo Charged Engines
Model(s):
TT, S4 A6, Turbo (Drive by wire) 2000 --> 2003
A4 with 1.8T (Drive by wire) 2000 -->2003
Condition:
Mass Air Flow (MAF) sensor incorrectly replaced due to rough idling, vehicle hesitation, car lacks power, multiple misfires or the following DTCs stored in
DTC memory:
P0103, P1111, P1112, P1128, P1130, P1144, P1145, P1146, P1147, P1148 or
P1557
All of the listed DTCs except P1144, P1145 and P1146 may be caused by air leaks in the pressure side air duct.
I read that if you have an engine control fault the ABS and Traction Control turn off because when the traction control turns on it also uses the engine control to reduce power.
As a note unhooking the MAF sensor did make the car drivable in a limp home mode. I would not run the car like that but in a pinch you could drive it for a short distance.
PS-The TSB Bulletin # 010207 is too large to attach. Here is the intro. Hopefully you can find it online.
Group: 01
Number: 02-07
Date: Sept. 30, 2002
Subject:
Diagnosis of Driveability Complaints on Turbo Charged Engines
Model(s):
TT, S4 A6, Turbo (Drive by wire) 2000 --> 2003
A4 with 1.8T (Drive by wire) 2000 -->2003
Condition:
Mass Air Flow (MAF) sensor incorrectly replaced due to rough idling, vehicle hesitation, car lacks power, multiple misfires or the following DTCs stored in
DTC memory:
P0103, P1111, P1112, P1128, P1130, P1144, P1145, P1146, P1147, P1148 or
P1557
All of the listed DTCs except P1144, P1145 and P1146 may be caused by air leaks in the pressure side air duct.
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