Any Ideas

1994 f150 5.0 MAF

HEGO lasts about 100-1500 miles and sensor dies without warning. Only code is 172, installing a new sensor takes care of problem without resetting codes.

I have replaced the injectors and tps, checked the wiring and cannot find anything wrong. Fuel trims are normal until sensor decides to stop functioning.

I am using Bosch sensors as they are available locally.

BOO/BPPoff
CANST PURGE on
ECT (V) Engine Coolant Temperature 0.9ECT (OF)
Engine Coolant Temperature 171
Engine Speed (rpm)660EVP
(V) EGR Valve Position 0.4EVR (%)
EGR Valve Position 0
FUELPW1(ms) Fuel Pulse Width 5.5
IAC(%) Idle Air Controller 34 IAT
(V) Inlet Air Temperature2.7IAT
(oF) Inlet Air Temperature 83
Loop Status closed
LT FTRM1 (%) Long Term Fuel Trim 0
MAF (V) Mass Air Flow0.8MAP ("HG)
Manifold Absolute Pressure 8.1O2
Sensor (V) (0.1-0.9Vdc) 0.64
Spark (o)14ST
FTRM1 (%) Short trim Fuel Trim 4
TOT (v) Transmission Oil Temperature2.2TOT (o)
Transmission Oil Temperature 104 T/P ModeC/T
TPS (V) Throttle Position Sensor0.9V
PWR (V)14.6V REF (V) Reference Voltage (5Vdc)5MPH0