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Hi All,
2003 Toyota Camry SE (4cyl), 233k km, car has been throwing a P0420 code, Catalyst System Effeciency Below Threshold (Bank 1).
I've been reading it could be an o2 sensor (or two) or an exhaust leak or even a bad cat..
- 02 Sensor, best place to buy? (Toyota / Lordco?)
- DIY or bring to shop?
Thanks! (I can wrench but I'm no mechanic..)
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