1998 Ford Escort 1998 Escort Zx2 Trouble code 172

Tiny
GFREEBER
  • MEMBER
  • 1998 FORD ESCORT
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 117,000 MILES
I have a 1998 escort Zx2 I keep getting a code 172 on it. I have replaced o2 sensors and injectors. The code states bad o2 sensor. Any ideas
Thursday, October 15th, 2009 AT 12:43 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0172 Running rich

Could be a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant temperature sensor that prevents the engine management system from going into closed loop mode
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Thursday, October 15th, 2009 AT 4:11 PM

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