Question

I have the engine codes P1121, P0507, and P0301 on my 2006 Nissan Sentra, what steps should I take to repair by myself?

Answer 1

I am not showing the P1121 as a valid code, the P0507 is for the idle higher then expected, the P0301 is for a misfire on cylinder #1

I would start with a tune up, then if you still have the misfire, replace the coil on cylinder 1. Then clear the codes and drive the car to see which if any comes back. You may resolve the issue after the tune up.

If the P0507 comes back, best to have the dealer do a relearn on the throttle. This is usually about a 30 minute job.

Answer 2

P1121 Nissan Code - Electric Throttle Control Actuator
Read more: https://www.autocodes.com/p1121_nissan.html

P0507 Nissan Code - Idle Control System RPM Higher Than Expected
Read more: https://www.autocodes.com/p0507_nissan.html

P0301 Nissan Code - Number 1 Cylinder Misfire Detected
Read more: https://www.autocodes.com/p0301_nissan.html