Question about 1999 Toyota Camry
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Posted on Jan 02, 2017
SOURCE: check engine light on P0125
I have to tell this: Your dealer screwed up. The P-0171 remedy was to clean the Mass Air Flow Sensor, NOT replace an O2 sensor. The P-0125 indicates that you have the insufficient coolant temp, which is a thermostat sticking open. This is why your idle is so high, the coolant is not up to operating temperature, 192 degrees F...Clean the MAF and replace the thermostat, and tell the dealer that he screwed up on the O2 sensor diagnosis/replacement. They put an O2 on for no reason. Better yet, have THEM clean the MAF and replace the thermostat. They owe you that much.
Posted on Oct 14, 2008
SOURCE: code's po171 and p0125
Bank 1 and 2 detecting too lean a condition. Yuck. Per the 1998 official Toyota shop manual for a Sienna, it could be a bad 1) coolant temp sensor 2) bad HO2S (or Fuel/Air sensors) 3) bad mass airflow sensor 4) restricted fuel somewhere (like the fuel filter in the tank! ouch.)
First, check to function of the coolant temp sensor. You can pull it and play wiht your stove and boiling water or just buy a Carchip data collector and download the data to your computer to analyze.
Second, before you replace that horribly expensive Mass Airflow Sensor, pull it out and *carefully* spray it clean with brake cleaner or an electronic cleaner of some sort. And do NOT touch any of the itty-***** wires inside with anything or you WILL be replacing it.
Third, if you have HO2S sensors, you can check the resistance of them using an multimeter to see if they are within spec. I forget exactly but it's something low like 9-12 ohms at 68F. If you have Fuel/Air sensors instead, it's dealer diagnostic time.
Fourth, if you suspect fuel pressure or fuel flow issues, I recommend dealer diagnostic time too. My best friend got severely burned (2nd and 3rd degree on 50% of his body) messing with fuel and his VW bug when we were in high school. 25 years later, he is still covered in scar tissue and will be forever.
I hope this helps you
Posted on Oct 06, 2009
Change bank 1 sensor 1 this will solve your problem. Tihs is a fuel issue nit a thermostat issue.
Posted on Oct 15, 2009
Testimonial: "I did what you suggested and it worked. Thanks. "
Was the computer reset after the thermostat was replaced?? If not, it must be reset to clear prior codes. as for the p1130/1135, they are related here is some info>>>>http://www.engine-light-help.com/toyota-engine-light.html
Posted on Mar 11, 2010
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