Question about 1988 Toyota MR2

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Got a 2nd hand O2 sensor cause my one wasnt working the management light is on constantly will this solve the problem i also have lost lots of power tooi hope this sorts it out. do i need to tune my car after it is fitted or will my car go back to normal once the new part is fitted?

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  • jesse179 Jul 29, 2009

    okay i got a new part a Bosch part and when i turn the key the dash lights come on and once the car starts all lights go off and then the management light comes back on what could this be?

  • Bruce Hathcock May 11, 2010

    If the 02 sensor is the problem you may have a plugged cat as well all you can do is try it a 1988 is pretty old and the cat being bad is a real possiblity. If to much fuel is fed into the engine and the unburnt fuel is sent threw the exhaust pipe it will kill and plug the cantalitic converter, you could remove it and check it by looking threw the cat you will see honeycombed shaped squares and when you hold it up under a light you should be able to see threw it. Is that the A3 engine in it?

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  • Master
  • 850 Answers

You still need it scanned to check it & reset light! etc.

Posted on Jul 28, 2009

  • ROB Jul 29, 2009

    this my good friend is the JOYS of MODERN MOTORING! lol

    your computer now wont recognise the changes made!

    it will need to be scanned & reset

    Personally im now returning my own vehicles to collectable no frills computer free BLISS !! lol

    I never could fathom electric windows ????

    ecause they are just something else to go wrong! but your arms are always gonna work! so wind up windows are no the way im going!

    it all = no stress & no bills lol

    please excuse my reality check!

    Cheers Rob.

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The pre cat sensors running lean does not mean they need to be replaced. They are are detecting a symptom. You need to know why.

If you are using a basic scantool (code only) you need to look up the P0000 code.
I thought this an odd code. I looked it up in my Autotap unit and it does not exist. The lowest # P (powertrain) code I have listed is P0016.

A regular scan tool, won't scan transmission or body codes, mu Auto tap doesn't either. You need a Tech 2 from the dealer for transmission codes.

First some history. The first O2 sensor was introduced in 1976 on a Volvo. California vehicles got them next in 1980, then federal emission laws made O2 sensors virtually mandatory on all cars and light trucks built since 1981. And now that OBD-II regulations are here (1996 and newer vehicles), most vehicles now have multiple O2 sensors, some as many as four!
The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust. The signal from the O2 sensor tells the computer if the fuel mixture is burning rich (less oxygen) or lean (more oxygen).
A lot of factors affect the richness or leanness of the fuel mixture, including air temperature, engine coolant temperature, barometric pressure, throttle position, air flow and engine load. Other sensors monitor these factors too, but the O2 sensor is the master monitor for what's happening with the fuel mixture. Problems with the O2 sensor can throw the whole system out of whack.
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If no signal is received from the O2 sensor, like when a cold engine is first started (more on that in a minute) or the 02 sensor fails, the computer orders a steady, rich fuel mixture. This is referred to as "open loop" operation because no input is used from the O2 sensor to fine tune the fuel mixture. If the engine fails to go into closed loop when the O2 sensor reaches operating temperature, or drops out of closed loop because the O2 sensor's signal is lost, the engine will run too rich causing an increase in fuel consumption and emissions. As you might have guessed, that will set a code and turn on your check engine light.
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The oxygen sensor must be hot (about 600 degrees or higher) before it will start to generate a voltage signal. Many oxygen sensors have a small heating element inside to help them reach operating temperature more quickly.
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The O2 sensors are expensive, diagnose what really is going on.

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