Went with a friend on Saturday to buy a MK4 GSI and yesterday went to pay for the car and pick it up.
On the test drive on Saturday the car drove fine, Pulled very well, no hesitations, no flat spots, no warning lights, no strange noises.
Yesterday the car started off fine and then about 25miles down the road it cut out and started driving like a pig,
Struggling to idle, coolant warning light was on, as was the engine management light, the car was down on power and making a strange noise from the exhaust, (a sort of chugging/faint burble) the engine was running very rough and vibrating violently in its mounts.
We left it to cool for a bit and then continued home, it ran fine again for a couple of miles but then did the same.
The TC and ABS light also came on and the speedo kept dying – although this isn’t that worrying as its more then likely just the wheel sensor that needs replacing.
When we got the car home I checked all the plugs and they were fine then read the codes and got the following (using the pedal method):
1106 – MAP sensors
0500 – speed sender unit – related to the ABS and speedo so no big surprise here
0509 – ICV High voltage
0160 – O2 sensor related
0136 - O2 sensor related
0130 - O2 sensor related
And 0179 – Fuel trim malfunction
I believe that my descriptions are correct but would appreciate it if someone could confirm.
How many of these codes are related?
I’ve had a good read up on the 1106 error code and it seems very common on the Z20LET but the fixes required seems very varied from a simple earth lead to a new turbo. Anything we can check to help narrow down the cause?
The previous owner has said that the BCS was replaced a few months ago as that failed and was causing a few issues so guess that can be ruled out????
I’ve checked all the hoses around the turbo and nothing seems to be loose.
The engine is 100% standard with 58K miles.
Any help would be really appreciated as it’s the guys new car and his introduction to Z20LET ownership hasn’t exactly been a great one.