I've been having some running problems with my octavia...... its been in and out of the garage... last visit it had the engine temp sensor replaced ( it ran badly before).... now its idle is lumpy and i had the managment light on. I have just had it plugged into the laptop and its giving me a P0172 Fuel trim, Bank 1, System too rich fault...... can anyone help ?.... wot is this ?... wot needs replacing ?

Try posting it in the ask a tech forum

Ive got it

What engine is it?

Could be

Air mass meter

Lambda Probe

Fuel in oil

Mate in works just got the opposite code on his S3. Bank 1 System too lean.