Hi guys, The other day I changed the oil, oil filter and air filter on my new Z3. It REALLY needed it! I then took it for a spin. After about 45 mins into the drive, my engine management light appeared on the dash. I was wondering if you guys have had the same issue before, on one similar to mine? My steps were: Removed the air filter casing and then changed the air filter with the new Bosch one - set it aside. Removed the top of the oil filter casing and removed the old oil filter - set it aside. Removed the oil drain plug and let the oil drain out into a bowl. The old oil was awful. - set the plug and washer aside. Put the new plug on with the new Bosch washer. Put the new Bosch oil filter in, also replacing the 3 O-Rings, and tightened the top back up. Filled the engine back up with Castrol oil. Put the air filter casing back together and back in the car. Let it sit level for a while, ran it, checked the dipstick (it was at the correct level), Reset the Oil Service Inspection Dial on the dash. Took it for a short trip, which was fine (no engine light). Later in the day I took it for another spin and that's when the engine management light appeared. I plugged in an oldish OBD tool I had into the footwell port and it came up with: P0136 - 02 Sensor Circuit (Bank 1 Sensor 2) P0170 - Fuel Trim (Bank 1) I have tried to search for these and I'm not too sure on what they mean, I'm a bit of a novice! I'm not sure if it's a coincidence or not really...? I think I've included everything. Thanks in advance everyone! Tony.