Need help with CEL Codes from '95 Contour

[murky024]

Alright, so a buddy and I pulled the codes from the car and I have the list but I cannot seem to find anything on the forum since it changed. I search in the archives and had little luck there to so maybe some of the regulars can help me.

Codes are:
172
173
176
177
542

Thanks for anything you can do.

[Tony2005]

Link to OBDI codes (1995)
http://www.thorssell.net/hbook/3digit.html

Link to old forums
http://www.contour.org/ubbthreads/ubbthreads.php?Cat=

For O2 sensor codes, check O2 Fuse (For 1996, it is Fuse 13), and then sensor connectors before buying a new one.

As for fuel pump code (542), check connectors. (you may have to get a new pump).

[meintool]

172 Oxygen sensor not switching - system was lean
173 Oxygen sensor not switching - system was rich
176 Oxygen sensor not switching - system was lean
177 Oxygen sensor not switching - system was rich
542 Fuel pump open, bad ground or always on

you need a some new o2 sensors and you also need to find out which wires are bad on your fuel pump

[murky024]

Thank you all for your help; I figured it would be a quick response.

[projectSHO89]

If your engine runs and there are no symptoms directly attributable to the fuel pump, the 542 should be ignored. It usually gets set on OBD-I systems when the engine stalls.


Steve