O2 Sensor Problems of Volkswagen Routan

My check engine light came on so I had the code checked it indicated that O2 sensors needed replaced then the code indicated a cylinder 4 misfire? ihave replaced the ignition coil pack, checked cylinder compression, changed spark plugs and fuel injector and I still have the po304 code engine misfire cylinder #4??? I am so frustrated what else could I be missing to clear this code issue?.

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August 11, 2010 the check engine light was one. Codes p0038 and p0032 for 02 sensor faults populated. The codes were cleared. We were without the use of our vehicle for approximately ½ day. September 13, 2010 the check engine light continued to come on. The grounds were tightened and the vehicle was test driven. A loaner/rental vehicle was issued for approximately 2 days. December 3, 2010 the check engine light was still coming on and off. Check and found fault codes stored for rear 02 sensor. The faulty rear 02 sensor was replaced. A loaner/rental vehicle was issued for approximately 4 days. February 18, 2011 the check engine light was still coming on. It was determined that the ecm needed to be reset. The ecm was reset and rechecked for codes. A loaner/rental vehicle was issued for approximately 1 day. May 13, 2011 the check engine light was still coming on. The Routan stalled out twice in one day while driving. The win module was replaced and two new keys were programmed for the vehicle. A loaner/rental vehicle was issued for approximately 10 days. October 31, 2011 the vehicle was humming during acceleration and pulling without properly switching gears. Metal was found in the pan bell, housing and compounds. The transmission was replaced. A loaner/rental vehicle was issued for approximately 13 days. December 7, 2011 the Routan stalled out twice when going from reverse to drive. A loaner vehicle was issued and we were without the use of our vehicle for approximately one day. December 16, 2011 the vehicle stalled while in motion twice, once while stopping at a traffic signal and again while parking and placing the vehicle in reverse. We took the vehicle to your dealership to be tested and repaired. We were issued a loaner vehicle. As of today, December 16, 2011, we are still without the use of our vehicle.

See all problems of the 2010 Volkswagen Routan 🔎.