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1998 Honda Civic Error Code P0172

Tiny
WIATROWSKI
  • MEMBER
  • 1998 HONDA CIVIC
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 66,000 MILES
My Civic has had poor gas mileage (27 mpg) since about 800 miles. I am now getting an error code P0172 - System too rich (Bank 1). What do I look for with this eror code?
Friday, March 13th, 2009 AT 11:51 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi wiatrowski,

For DTC P0172 the following are possible causes :

Fuel pressure regulator clogged or stuck closed.
Clogged fuel return line.
A leaking fuel injector.
Fuel octane level less than specification.
A deteriorated primary HO2S-1.
Insufficient EGR system flow (D16Y5 engine).
A leaking or stuck open EVAP purge control solenoid valve.
Proper valve adjustment.
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Monday, March 16th, 2009 AT 2:15 PM

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