Pontiac Grand Prix reduced engine power issue persists after replacing throttle body and pedal on Pontiac Grand Prix

Some Pontiac Grand Prix owners report experiencing persistent reduced engine power issues even after replacing the throttle body and pedal assembly. These owners often find that simply replacing faulty parts may not fully resolve the problem, necessitating further diagnostics to identify the root cause. Additionally, ensuring that replacement parts are compatible and properly installed is crucial to avoid performance issues. If the reduced engine power light remains illuminated post-replacement, it may signal underlying problems requiring in-depth troubleshooting. Diagnostic trouble codes stored in the OBD II system can offer valuable insights into specific areas needing attention. Furthermore, some owners have found success in resolving similar issues by also replacing the throttle position sensor along with the throttle body and pedal assembly.