i have a strange fault code of p0172 too rich partial load, its had a new pipe fitted at the back of the manifold and a new bosch lambda, but still get this fault when you clear it it comes back with in 10 miles. the actual value at idle is around 900 mv and should be above 1100 to 1500 mv. could anyone advise me on this, i was told there is a crank case pipe and valve on this but the idle on this car is lovely and drives very well. it has also had an update on the ecu.
mant thanks if anyone could point me in the right direction on this.

Welcome to MBWorld! Might have better luck posting up your question in this section of the forum.

-Luccia