Engine code headache

Zach2456

New Member
Evening all, new to the forum, need some help/advice

Recently purchased a 2007 A6 2.0 TFSI privately, has 110kish miles, was the lowest I saw on auto trader at the time so went for it. Purchased it mid July time.

Took it to the garage the next day, done a service on it, full service as mechanic told me it needed one after showing me how bad the spark plugs were and oil . At that time the mechanic noticed a slight misfire, he switched the coils around, problem gone for the time being.

Since then have used the car and it's been driving good. The last 2 weeks had a coolant leak issue, was able to find the leak, the thermostat housing needed changing, replaced that and now the misfire has come back. The mechanic used the machine to diagnose it and found the following codes P0202/P0300, told me that the machine said there was no communication for cylinder 2. Decided to change coil packs, brand new ones but still the same issue. I don't know what he did afterwards or maybe the coil pack did but the codes went and there wasn't a misfire.

Driving home and suddenly car goes into limp mode, won't go past 25-30mph, long journey home basically. Got it to the driveway and the following day called RAC, they diagnosed it and sent me a report of the codes but explained to me it could be the coil pack or spark plugs or fuel injector or the wiring to the fuel injector.

RAC DIAGNOSTIC SYSTEM
System Type: ENGINE SYSTEM TEST/VALUES
Name: BPJ - MOTRONIC
DTC: P0202,Injector Circuit Malfunction - Cylinder 2
DTC: P0300,Random / multiple cylinder misfire detected
DTC: P0302,Cylinder 2 Misfire Detected
DTC: P0304,Cylinder 4 Misfire Detected
System Type: ENGINE SYSTEM TEST/VALUES
Name: ASB - TDI
DTC: P0202,Injector Circuit Malfunction - Cylinder 2
DTC: P0300,Random / multiple cylinder misfire detected
DTC: P0302,Cylinder 2 Misfire Detected
System Type: ENGINE SYSTEM TEST/VALUES
Name: AUK - SIMOS
DTC: P0202,Injector Circuit Malfunction - Cylinder 2
DTC: P0300,Random / multiple cylinder misfire detected
DTC: P0302,Cylinder 2 Misfire Detected
System Type: ENGINE SYSTEM TEST/VALUES
Name: BAT - MOTRONIC
BBJ - MOTRONIC
BNG - TDI
BSG - TDI
BVG - TDI
BVJ - MOTRONIC
BXA - MOTRONIC
DTC: P0202,Injector Circuit Malfunction - Cylinder 2
DTC: P0300,Random / multiple cylinder misfire detected
DTC: P0302,Cylinder 2 Misfire Detected
System Type: ENGINE SYSTEM TEST/VALUES
Name: BDW - SIMOS
DTC: P0202,Injector Circuit Malfunction - Cylinder 2
DTC: P0300,Random / multiple cylinder misfire detected
DTC: P0302,Cylinder 2 Misfire Detected
System Type: ENGINE SYSTEM TEST/VALUES
Name: BDX - SIMOS
CCDA - SIMOS
CCEA - SIMOS
DTC: P0202,Injector Circuit Malfunction - Cylinder 2
DTC: P0300,Random / multiple cylinder misfire detected
DTC: P0302,Cylinder 2 Misfire Detected
System Type: ENGINE SYSTEM TEST/VALUES
Name: BKH - SIMOS
BYK - TFSI
BYU - FSI
CCAA - TFSI
DTC: P0202,Injector Circuit Malfunction - Cylinder 2
DTC: P0300,Random / multiple cylinder misfire detected
DTC: P0302,Cylinder 2 Misfire Detected
System Type: ENGINE SYSTEM TEST/VALUES
Name: BLB - TDI
BNA - TDI
DTC: P0202,Injector Circuit Malfunction - Cylinder 2
DTC: P0300,Random / multiple cylinder misfire detected
DTC: P0302,Cylinder 2 Misfire Detected
System Type: ENGINE SYSTEM TEST/VALUES
Name: BMK - TDI - MT/AT
DTC: P0202,Injector Circuit Malfunction - Cylinder 2
DTC: P0300,Random / multiple cylinde

At this point I'm asking if anyone has had any problems like this or maybe know what I should do next as my mechanic is a bit reluctant to solve this as he believes it will be a trial and error job and lengthy also.

Any advice will be appreciated
 

Pee Jam

A6 Avant LeMans 3.0L Seat Alhambra xcellence
Gold Supporter
Hi Zach

I would suspect the wiring loom personally, seeing as when the coil pack was first moved the fault went away and did not follow the coil pack.

Wiring faults can be tricky to find!
 

Zach2456

New Member
Hi Zach

I would suspect the wiring loom personally, seeing as when the coil pack was first moved the fault went away and did not follow the coil pack.

Wiring faults can be tricky to find!
Thanks for your reply , appreciate it, sorry in responding late

So my mechanic was able to fix it, he said that there was a problem with the wiring loom as you said, because some of it had come out and was damaged but he managed to repair it some way and also the fuel injectors needed a clean, after that there's no misfire and the car is perfect, mpg has improved slightly which im glad about
 
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