Question about 2000 Toyota Corolla
They are two oxigen sensors. High and low, before you change any one of them, tray to take your car to autozone or napa. They can check it for you for free, and they can tell you which one you need to change.
both oxygen sensors are in the bottom of the car, before and after catlic converter. Make sure you left the car using hydraulic or mechanical jack and secure it with 2 stands. disconect the ox sensor and remove it from the exhaust pipe. Let me know if you still have any problem
Posted on Oct 04, 2009
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Posted on Jan 02, 2017
The catalytic converter has an oxygen sensor in front and behind it. When the
vehicle is warm and running in closed loop mode, the upstream oxygen sensor
waveform reading should fluctuate. The downstream O2 sensor reading should be
fairly steady. Typically the P0420 code triggers the Check
Engine Light if the readings of the two sensors are similar. This is indicative
of (among other things) a converter that is not working as efficiently as it
should be (according to specs). It is part of the vehicle emissions system.
Symptoms You will likely not notice any drivability problems, although there may be symptoms.
Causes A code P0420 may mean that one or more of the following has happened:
Posted on May 26, 2011
The trouble areas associated with this code are as follows:
1)Gas leakage on exhaust system
3)Heated oxygen sensor
4)Three–way catalytic converter
The idea is to check for exhaust leaks first then the front sensor and rear sensor. If these all check out then the cat needs to be replaced.
Hope this helps. Thanks for using fixYa
Posted on Nov 06, 2009
You cannot guess with these cars,these vehicles have a lot of sensors and actuators can can go bad at anytime, here is my suggestion take your vehicle and to Auto_zone and have them check the codes, they will be able to tell you what they mean. ITS FREE.. then get back to me if you need more help.
Posted on Dec 23, 2008
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