Question about Cars & Trucks
The code 421 is a problem with the catalytic converter or O2 sensors on bank one. Under normal conditions the front and rear sensors should be giving different readings back to the computer and they are more or less the same.
Code 431 is the same thing for bank two.
Unless you find a big exhaust leak, I doubt this is something you can fix yourself. You would need a scanner to watch the readings coming from the O2 sensors and the engine temp among other things to be able to determine the cause or causes.
Posted on Jan 05, 2013
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Posted on Jan 02, 2017
SOURCE: P0421, P0431
Technically, you can put the car in neutral and press the gas while the car is running, til it reaches 3500 rpm. You don't have to actually have the car on the road while you do this.
Posted on May 30, 2009
its pretty simple. take the inside inspection plate off, dont break tabs, unplug the electric connector, take out the 3 screws and mirror comes off. replace in reverse order. Its easier if you roll down window.
Posted on Jan 30, 2010
There is a tensioner pulley for each belt, you loosen the nut on the front of the pulley, then there is a tensioner bolt that you loosen, that will move the pulley away from belt to remove the belt. You'll need to get to them from the passenger side under the car. You'll need to remove the plastic covers to get them.
Posted on May 02, 2010
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