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This Avalon has a PO125 error and I have done.

Tiny
ANONYMOUS
  • MEMBER
  • 1997 TOYOTA AVALON
  • 84,000 MILES
This Avalon has a PO125 error and I have done every basic suggested fix but it still is registering.

Replaced coolant
Bled Coolant
Replaced Thermostat
Replaced Coolant temperature sensor
Replaced both upstream O2 sensors - Denso Only
Cleaned MAF sensor
Cleaned PCV valve
New Spark Plugs
New Valve cover Gaskets
Checked for blown fuses - two banks of fuses - engine compartment
Replaced air filter


Suspecting - Fans, fan switch, Fan relay. Fans have not come on since working on this car. (My mothers car) I own a 2002 sienna with same engine and I recently replaced hoses and coolant and fans were running even before van reached operating temperature. I have OBDII code reader/analyzer and have been resetting this 125 code. Could the fan topics I listed be creating this PO125 code? If so what is a good way to test each of these before just buying and putting in new parts? I also read the ECU might be the issue. I also read that the gas cap could be the issue? Help :)

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Tuesday, January 29th, 2013 AT 11:01 PM

6 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I suggest stop throwing parts at it and get a proper diag. It would have saved you a ton of money.

This is an air/fuel ratio issue that needs to be monitored by a scan tool. Do not erase the light as it contains freeze frame data at the time of the failure.

It could be as simple as a coolant sensor, exhaust leak or injectors needing cleaning.

Roy
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Tuesday, January 29th, 2013 AT 11:09 PM
Tiny
SWEETWALLY
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  • 4 POSTS
I will clean the injectors next. I have replaced the coolant sensor and recently had the exhaust checked and repaired as the flex pipe was broke.

Thank you for the advice. I will follow-up with my result of the injector cleaning.
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Tuesday, January 29th, 2013 AT 11:33 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No additives, they rarely work. Have a professional cleaning done

Roy
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Tuesday, January 29th, 2013 AT 11:41 PM
Tiny
SWEETWALLY
  • MEMBER
  • 4 POSTS
I did this work on my Sienna as you are correct. I tried additives and it did not solve my issue with it. I took the throttle body apart and soaked it and issue was fixed. It was thick and black. The van would not start on its own as the gas was getting absorbed by the muck. I put a new gasket when reassembling.
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Wednesday, January 30th, 2013 AT 12:00 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good job
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Wednesday, January 30th, 2013 AT 12:16 AM
Tiny
SWEETWALLY
  • MEMBER
  • 4 POSTS
After doing all of these sensor and maintenance replacements, I cleaned out the throttle body and the issue is resolved. I got a temporary PO110 code but that is because I flooded the throttle body because it was caked with sludge. When I started it up, I had a white cloud of smoke from it burning off the cleaner. I did a reset of the 110 code and ran the car for :30 mins and no code. I also added cleaner to the tank after the throttle body cleaner long burned off.
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Tuesday, May 21st, 2013 AT 8:19 PM

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