Hyundai i40 P0121: TPS → Switch “A” Circuit Range → Performance Problem

P0121 is a relatively common trouble code with the Hyundai i40. It’s an OBDII code and has to do with the Throttle Pedal Position Sensor. It is relatively serious problem since it can leave your vehicle in failsafe mode. P0121: Throttle Pedal Position Sensor → Switch (TPS) A Circuit Range → Performance Problem OBDII code … Read moreHyundai i40 P0121: TPS → Switch “A” Circuit Range → Performance Problem

Hyundai i40 P0420: Catalyst System Efficiency → Below Threshold → Bank 1

This page is meant to help you troubleshoot the Hyundai i40 P0420 trouble code. It covers Hyundai i40 P0420 meaning, symptoms, causes, and possible solutions. WIth the i40, OBDII P0420 is often caused by a bad oxygen sensor, but there can be other causes as well. Jumping straight to replacing the O2 sensor can cost … Read moreHyundai i40 P0420: Catalyst System Efficiency → Below Threshold → Bank 1