P0121 Chevrolet - hhr , what part do I need to buy?

Question

I got a code of p0121 and I need to know if you can tell me what part I need to buy for it. Its a 06 Chevy HHR engine size 2.2. Thank You

Answer 1

P0121 Throttle position sensor 1 performance

This necessarilly does not mean you buy anything, what this code condtiion means is that you have a unexpected airflow rate that is unexpected or more than expected. What you should have done is look for vacuum hose or vacuum leaks that can cause this code condition.