Engine problems of the 2003 Nissan Sentra

The "service engine soon" light came on. I took it to my mechanic. He ran it through the computer and told me that it could be a transmission problem. I had a transmission flush done and light went off. A week later the light came back on. And now the car wont start. I went to the NHTSA. Gov website, read that the crank position sensor, or the camshaft position sensor or the variable timing control sensor, on the make, model and year of my car, could be causing problems. It could be causing engine power loss, which it does struggle. The "service engine soon" light to come on, which it did. Or a "not starting-up condition" which is where I'm at right now. The car does not want to start. Please help me because I think that I qualify for these services to be done to my vehicle. Thank you for your time.

Nissan Sentra ser spec v 2003 has power failure problems, experiencing a mild loss of acceleration. Driving at 70 mph, vehicle lost full power and reduced speed to 40 mph, shut down by itself. Took it to dealership and they discovered that the screws and the "power valve" were sucked into the engine bay. Internal engine damage, same problem as 2004-2005 qr25de engine recalls, but manufacturer has not issues a recall for the qr25de in 2002 or 2003. Please request Nissan north America to issue a "power valve recall" for the years 2002 and 2003 as well. There are several consumers that have experienced the same problem.

- the contact called regarding the 2003 Nissan Sentra. The driver was traveling at 45-50 mph when the engine suddenly shut off,and the vehicle continued to move. The driver applied the brakes and the vehicle would not stop, and the steering wheel locked. The road conditions were icy. The vehicle hit a cement wall. The driver and passenger air bags deployed. There were no injuries. The contact was given a police report. The failure mileage was 50,000. The vehicle was towed. The insurance investigator was going to inspect the vehicle on 2/27/07.