Golf GT Running Rough

[neelyp]

Mate has one of these super/turbocharged things. Has started running rough and a warning light that looks like an exhaust started flashing, but is now constant, came up on the dash. Car is out of warranty so any pointers or common faults would be much appreciated to save him from a raping at the dealers.

[the-photographer]

• Try and find someone who can read ECU error codes
• Check usual suspect sensors (MAF/O2)