Question about 2000 Toyota Tacoma PreRunner
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
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Posted on Jan 02, 2017
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
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
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
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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