whats this fault...any ideas

[marty]

The obd fault on my bug is "fuel trim-system rich(bank1)" fault number 16556 dose any1 have a mr magoo what this is :-/

[Stan24v]

First thoughts were MAF, and my assumptions were correct it seems ;)

Possible Symptoms
Irregular behaviour
[edit]Possible Causes
Fuel system
Excessive fuel pressure
Leaking or contaminated fuel injectors
Leaking fuel pressure regulator
Low fuel pressure or running out of fuel
Vapor recovery system
Air leaks after the MAF
Vacuum leaks
Improper seated engine oil dipstick
Stuck EGR valve
Oil overfill
Cam timing
Cylinder compression
Exhaust leaks before or near HO2Ss.