Question about 2000 Toyota MR2 Spyder

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Failed smog 2000 toyota mr2 spider. Failed smog due to running rich and they said it was the o2 sensor. I bought the car 3 years ago and had to have it replaced then to pass. Why after only 3 years?

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  • billie ramos
    billie ramos May 11, 2010

    you mean it the o2 failed again?

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I have a 1989 toyota mr2 supercharge it is24 years old , this is the first time I had to change oxygen sensor, it passed after that, also set the timing. This has been the best car I've ever had.Im still driving it and i am the only person who owned it. Keep it,its a good investment. I have been asked if I want to sell it, but I just can't part with it.

Posted on Apr 04, 2013

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O2 sensor data needs to be checked once engine is warm to ascertain if it is functioning correctly.several factors can cause premature failure of this sensor,inferior quality part,poor fuel,spark,temperature,even over torquing when fitted.I have seen many come in that have a soot coating on the sensor affecting function,once cleaned and main fault fixed,they have worked fine.check that the thermostat is running engine at correct temp as this affects fuels ratio,and will give a fail on test.easy basic test...does temp gauge swing to middle after warmed up ,and stay there on m.way run.oh and dont forget to get plugs replaced if std type and done 30k+,platimuns/iridiums although long life still need inspecting.

Posted on Jul 24, 2009

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Jan 11, 2016 | Toyota Cars & Trucks

1 Answer

Runs rich


How can you fail more than once?

After you fail, you go to a repair shop &
resolve ALL Vehicle issues

Then the shop road tests until all 8 I/M Monitors
run clear ,or there is no reason to go back to inspection
knowing your going to fail.

The problem is the shops & peoples inability to explain
what they need taken care of.

If you never work on the vehicle for years,then you don't
go to inspection,it is a given you will fail

Spark Plugs-every 3 years
Check for Cylinder Misfires
Always install a New Air Filter before inspection
Always install new fresh full sys oil before inspection

Oxygen Senors get replaced every 100,000 miles

Have to road test with professional scan tool & look at
all data,check monitors,fuel trim,O2 etc & check for codes

You have to spend the money to evaluate the vehicle, to see
if it is ready to go for inspection,not many are,their just driven
& neglected

Rich could be-- O2 Sensors,Dirty MAF Sensor,Vacuum Leaks,
Injector Leaks & more,I have seen a dirty air filter fail a car

Mar 27, 2014 | Acura Integra Cars & Trucks

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Failed co emissions


If the cat converter is aftermarket, most of them are inadequate to reduce emissions enough on a big motor.

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Not passing smog, no code or engine light


Its going to be tough to find the problem without access to a 4 gas machine. Especially if there are no trouble codes in the computer.
If the fuel mixture is rich it should set a code for one or both O2 sensors. Same thing if the EGR is not working, etc.
One thing that could cause problems is the thermostat not getting the engine up to normal temp.

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could be a vac leak or injector problem

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My 2000 Toyo. Tacoma Prerunner TRD V6, truck Failed smog due to the part #3 Functional Computer Tests due to an erased MIL. But had passed the Visual Inspection, and Emissions. So i bought a Code reader...


there are 2 sensors in the system
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if that one is faulty it is most likely the reason for running lean or rich
the second sensor is the oxygen sensor (O2) which is after the cat converter and reads the results of the cat converter cleaning the exhaust
you may have to replace both the sensors to get a clearance or replace the cat converter as well as the HO2S unit

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Most likely it is an O2 sensor malfunctioning but since it is signally the ECM is not registering it as bad. Replace the O2 sensor.

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Not positive on this so consider only. The o2 sensor is what actually tells everything else what is going on with emmission and everything else adjusts to what info it relays. The o2 is also subjected to extreme temps and cooling cycles. So, instead of spending money on no answer diagnostism give replacement of o3 sensor so consideratio. If you choose to replace, wd40 and let exhaust cool down. Good Luck.

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check for vacuum leaks especially around the intake manifold gasket. Although the engine appears to be running rich, it could also be misfiring due to being too lean in one cylinder. When the cylinder doesn't fire the charge, it goes into the exhaust completely unburned and looks like a rich running condition due to the unburned fuel. If it is a vacuum leak causing the problem, the engine will run fine at road speeds but misfire at idle and not pass smog.

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