Close
Car Questions
RepairPal is your advocate for car care advice and guidance

Analysis codes P1491 & P0172

(2002 Acura MDX)
in Lovington, NM on January 08, 2010
My CEL came on and remained. Local shop check reflected a temp code P1491-exhaust gas recirculating valve lift insufficient & perm code 0172-system too rich. What does this mean? Incidently, after the check the CEL went out but I am still concerned since a trip is coming up.
Displaying 1 answers & 0 comments
Popular Answer
on January 14, 2010
The EGR Valve Lift problem is generally a defective electronic EGR Valve. It is the Sensor on the Valve that goes bad. The P0172 Fuel Trim code is a bit trickier. You will need to inspect the fuel trim numbers. An over-reporting Mass Air Flow Sensor will cause this, but have a good tech verify these issues.
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide. Learn more

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
Rear break lights and blinkers working. Tail lights not working when driving and headlights are on
Both Key fobs are locked in the car. Is it ok to call a locksmith or can the dealership unlock it remotely?
Didn't find what you were looking for?