Question about 2000 Toyota Tacoma PreRunner

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A/f sensor circuit 2000 tacoma 2.7

Trying to get a truck to pass smog. mil intermittently appears saying a/f sensor circuit performance. replaced a/f sensor. now what?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 6 Answers

SOURCE: no power to fuel pump. I have power up to the circuit opening relay.

I am not positive how the electronics are routed on a later model truck but I had this same problem on my 89' with a 22re. It turned out that the oil pressure sending unit was in the fuel pump circuit so as to not allow the engine to start with no oil pressure. I changed my sending unit and the truck fired right off. Hope this helps.

Posted on Nov 05, 2008

co7196
  • 3433 Answers

SOURCE: Prerunner wont pass smog due to engine service light

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.

Posted on May 07, 2009

csmock132
  • 4669 Answers

SOURCE: car wont pass smog.

Is it running rough? Is the check engine light on?

Posted on May 27, 2009

superjorge1
  • 8 Answers

SOURCE: have p0130 and p0133 codes 98 toyota tacoma

check the mass air flow sensor there maybe dirt on the filiment inside the sensor causing false readings. cleaning or replacing it may make the codes go away.

Posted on Nov 18, 2009

youredone82
  • 426 Answers

SOURCE: 1996 4 runner had p0171

what is the resistance of the wires between sensor and ecm connector, excess resistance from varying gauge wire and solder or solder-less connections can cause problems

Posted on Mar 10, 2011

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As it is not passing the smog test I would be replacing the HO2S sensor ( manifold or before the cat on bank 2 of the engine ) or more likely a failed cat converter
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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.

Jan 29, 2013 | 2000 Toyota Tacoma PreRunner

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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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Prerunner wont pass smog due to engine service light


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.

May 07, 2009 | 2000 Toyota Tacoma PreRunner

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