[Shotimes] RE:EEC Codes

[Victor Allen]

Finally got around to checking error codes yesterday (Chicago = 69
degrees - who hoo!), got 171,173 and 542.

Looked them up;
 172 & 173 = O2 sensor not switching is/was lean(172) or rich(173).
 542 = Fuel pump open, bad ground, always on.

the test was done only to get stored codes, the CE light has been coming
on (first sporadically, now regularly) after running for two-three
minutes, sometimes extinguishes when/after driving @2-2.5K rpm in lower
gears (2-3rd).

My question is; are these two sets of codes at all related?

TIA

Victor Allen
92X191K