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What is your question?
2005 Toyota Matrix code PO0420
How long has your 2005 Toyota Matrix had this problem?
A few weeks
2 Replies
This code referes to catayst efficiency. Basically the downstream bank one sensor could be fautly or the wiring or the your catalytic converter is not working well. Either way more hands on testing will be required before replacing parts.https://repairpal.com/repair-shops Alex