Step-by-step instructions on how to replace the coil pack and spark plug on a 2016-2020 Kia Optima.
- Step-by-step instructions on how to replace the tensioner pulley ( drive belt tensioner) on Hyundai and Kia vehicles equpied with the 2.4L Theta II Engine. Pictures and videos are based on a 2019-2020 Kia Optima, but the same engine is used on several other Kia / Hyundai models.
- Code P0420 means Catalyst system efficiency below threshold (bank 1 or 2).
P0420 code means your catalytic converter is not operating at maximum efficiency, either because the catalytic converter needs to be replaced or there is a problem with one of the oxygen sensors.