2000 toyota celica

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#1
???I have a 2000 celica showing codes of P0420 Cat threshhold and P1349 VVT Misfire. does anyone have a good idea of what would be the best trouble shooting route for these codes? I've read about both codes and there seems to be alot of confusion about what causes the codes to set.
 

Paul

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#2
Is this the 1ZZ or 2ZZ 1.8L,if you are not sure look at the underhood sticker.How many miles on the vehicle?What have you done for maintenance?
 

2POINTautO

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#3
Go to MOTOR Magazine archives, Feb 2006, and June 2001 for some Cat Conv diagnosis info, I have not yet seen the other code anywhere. Proper diagnosis really requires some test equipment and some experience to be sure that you are not just going to throw an expensive OEM Cat Conv since that is the most common problem but not 100% for sure.
 
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#4
The motor is a 1ZZ and has about 142,000 miles, maintenance has been normal oil, brakes, belts, lube, air cleaner, plugs wires at or close to suggested intervals.