Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 2004 Toyota Matrix 1.8L 4 cylinder 189,000 miles DTC's are P0442 & P0446 › Reply To: 2004 Toyota Matrix 1.8L 4 cylinder 189,000 miles DTC's are P0442 & P0446 May 12, 2021 at 12:08 pm #990549 college manModerator this may help with troubleshooting. https://www.youtube.com/watch?v=cpiuNdKKrzA