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P0420 code 4runner 2000

5K views 2 replies 3 participants last post by  coontai 
Are you having any drivability issues? If so, change the coolant temp sensor first. It often the culprit. Plus its cheap $30 bones...

It could also be a stuck open thermostat.

Regardless, you need to first get your enigne operating in the correct temperature range.

I had issues with my gas gauge a while back. Cost over $700 at the dealer. They replaced in in tank sensor and the board on the dash. It is apparantly a common problem.

Also, how many miles you got on the truck?
 
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