Question about 2004 Toyota Sienna
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Posted on Jan 02, 2017
The P0420 code is Catalyst System Efficiency Below Threshold (Bank 1) error.
A code P0420 may mean that one or more of the following has happened:
offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
Posted on Oct 26, 2009
If you have the HID bulbs, and there is moisture in the bottom of the assembly, the high voltage box at the bottom will not work. this requires removing the whole headlamp, removing the circuit board from the bottom and drying out. I have done mine twice before finally finding how water was getting in at the top seam of the lamp assembly. You will have to dis-assemble part of the wheel well and bumper cover to gain access to all the mounting bolts. Best of luck
Posted on May 02, 2010
P0420 is catalyst system efficiency below threshold (bank 1)
P0440 is evaporative emission control system malfunction
P0441 is evaporative emission control system incorrect purge flow
Posted on Mar 29, 2009
7 out of 10 times that means that one of the cat's have gone bad. Most of the time it happens when your mileage is around 100,000 miles. The only thing is to do is to change the bad cat.
Posted on Aug 30, 2009
If you think the catylist is ok check your 02 sensor instead. P0420 is about the convertor and maybe water got in your tank fron filling it at a fuel stop with low reserves in their tank. They all do have water in their tanks. If you like fill your tank and the disconnect your battery for 15 minutes. reconnect it and drive the car 50 miles or more on the highway. This may clear your codes out
Posted on Jan 23, 2010
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