Question

2007 Nissan Quest with engine codes P2122, P2138, P0634, and P0550. The vehicle won't accelerate

Answer 1

You must start by clearing all the codes and checking what codes comeback first. You could have a problem with the throttle body.

P0550 NISSAN Code - Power Steering Pressure Sensor Circuit Malfunction
Read more: https://www.autocodes.com/p0550_nissan.html

P0643 NISSAN Code - Sensor Power Supply Circuit Short
Read more: https://www.autocodes.com/p0643_nissan.html

P2122 NISSAN Code - Accelerator Pedal Position Sensor Circuit Range/Performance
Read more: https://www.autocodes.com/p2122_nissan.html

P2138 NISSAN Code - Accelerator Pedal Position Sensor Circuit Range/Performance
Read more: https://www.autocodes.com/p2138_nissan.html