Recently cleaned the throttle body after the revs were unstable & car down on power. Was fine for about a week, then emu light came on, error code 16486 - Mass Air Flow Sensor (G70): Signal too Low

P0102 - 35-00 - -

The car was not picking up smoothley, revving erratically, running rich, smell of petrol & soot around the exhaust. Disconnected the MAF & the car drove much better.

Skoda wanted £120 for a new one, so I tried a genuine second hand one off an auction site for £20. The revs settled down immediatley but the car didn't pull under boost like she used to. After about 50miles, light came on again with the following code:

17536 - Fuel Trim; Bank 1 (Mult): System too Lean

P1128 - 35-00 - -

This points to a dodgy MAF, oxygen sensors or fuel injectors. I did put some redex injector cleaner in the tank after cleaning the throttle body, maybe this dislodged something & blocked the injectors? Maybe I have bought a dodgy MAF? Maybe the oxygen sensor is covered in soot/ unburnt fuel?

HELP!!!

Thinking of taking it to a VAG specialist to get it sorted but there are too many variables (dodgy MAF, injectors blocked, redex causing it to run lean) for them to get a correct diagnosis I think.

Should I just drive it around a few hundred miles (I do 300miles a week) to flush the injector cleaner out, then buy a new MAF from Skoda, then get it serviced (last full service was 8 months/ 8000miles ago)?

This is doing my head in, please help.

Edited 18 April, 201214 yr by harry56789

Where are you? If someone is near by you might be able to try their maf.

Walsall, West Midlands.