Hi, I have a 2000 (x Reg) Celica VVTI. I'm told my 'front oxygen sensor' is faulty. Not wanting to pay garage prices I am looking to replace it with a good 2nd hand part but can you tell me what I'm looking for and where is it in the car (presumably on the exhaust but is it in the engine compartment and visible from above, or only visible from below)?
Any photo or diagram would help.
can't tell you exactly where it is, but it will be on the first section of the exhaust (usually within a fooy or so of the manifold). There are a few types of Lambda sensor but they basically do the same thing. If you are a bit of a handy man, consider buying a universal sensor off ebay, they are much cheaper and just as good. You will have to use your original connector, so you'll need a pair of snips and some electrical connectors (scotch blocks etc)
In your ebay search type "universal lambda sensor"
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The first thing is to have the computer scanned for codes. the check engine light should also be on with the engine idle too high.Scanning for codes is the best first step in finding the problem. this could be caused by a vacuum leak or bad throtle postion sensor or mass air flow sensor and more.Go to an auto zone or other auto parts store ,they will scan the codes and give you a print out of the codes. get me the codes and i will try to help you solve this problem.
this obd2 trouble code table can help you understand the meaning of code, for po420, you can try:
Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
inspect the downstream heated oxygen sensor (HO2), replace if necessary.
Replace the catalytic converter.
Locate the upstream and downstream oxygen sensors under the vehicle near the front axle. The upstream and downstream sensors resemble spark plugs with several wires connected to them. Remove the sensors by turning them clockwise with a 22-millimeter wrench.Locate the wiring harness inside the vehicle under the centerconsole on the front passenger side. Disconnect the electrical connectors for the oxygen sensors. Feed the wires down through the vehicle and pull them out under the car.Feed the wiring assemblies on the new sensors up through the floor of the vehicle. Reconnect the wires in the wiring harness. Screw in the new oxygen sensors with your fingers. Once they are in place, tighten them with a 22-millimeter wrench.Remove the jack stands and lower the Celica to the ground. Remove the tire blocks. There should be a sensor before the CAT converter, and one RIGHT after it.
The catalyticconverter 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.