Trouble code po125

1998 TOYOTA COROLLA
144,000 MILES • 1.8L • 4 CYL • FWD • AUTOMATIC
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ITOBOY1
  • MEMBER
  • 5 POSTS
I have a trouble code of PO125 and need to know what I need to change.
Jul 11, 2017 at 9:06 AM
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HMAC300
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 48,601 POSTS
You need to check oxygen sensor in front of catalytic converter. The coolant temperature is too low to go into closed loop. See picture on how to test it.
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Jul 11, 2017 at 9:29 AM