Hello, I have a BMW 325i E46. OBD II reading of P1156, P0172 and P0175.

Sorry, VANOS seal is the Valve Cover Gasket? Funny because i just change my spark plugs and the threads on my old Spark plugs had oil on them but where the spark hits is clean. Would that be the Porblem?

The VANOS is the mechanism that controls the valve timing on the intake and exhaust camshafts on your 325i. It is linked to the timing chain and is controlled with oil pressure. There are seals that wear in this mechanism. Our shop does a repair that includes the seals, spark plugs, and valve cover gasket for about $600.

This is definatly the problem. I'm a Soldier stationed in Germany and every machanic here just tell me to change the O2 sensor on bank two. I knew that wasn't correct. Even the BMW dealers here. I got to tell ya thanks for all the help. I'm not a machanic in any way but like to work on my own car. Thanks again!

Sorry forgot to add that. I replaced that too. :( Also I just completed cleaning the Fuel injectors. The light came back on and as I started the engine the Idle was bad and the exust smell bad. I took for a spin and I returned the exust was fine, stunk a little but far better and the idle was back to normal. I checked the generic OBD II codes again and I received codes of P1156, P1100 and P0004. Every time i change somthing on the car the codes will default back to these three codes over time they change, P1156 always stays though.