Motor Control Sensor Failure advise please
I have just purchased from a dealer my first ever Alfa, a 147 TS Collezione 2007, with 60,000miles on the clock. I think its fantastic and is the best car I have ever owned, but the other day I had the dreaded MCSF come up on the dash, and then went off leaving the engine management light permanently displayed. The car seemed to drive fine, but I had my local garage read off the fault codes, the results are, P0139 O2 sensor signal after CAT (slow), P0420 catalyst converter, P0136 O2 sensor signal after CAT, P0130 O2 sensor 1 signal before CAT, P0150 sensor 2 signal before CAT. The garage cleared the faults off (2 days ago) and then today on a 200 mile drive,the MCSF display has come back, The car seems to drive fine, although I think it may be using a little too much fuel. Any thought before I contact the dealer?