yo Spartan,
WELCOME!
173
(R,M)
Oxygen sensor not switching - system is or was rich - Single, Right or Rear HO2S - Fuel control
DTC 173 Oxygen sensor not switching - system is or was rich - Single, Right or Rear HO2S; "...I'd guess there's either an obstruction in the exhaust pipe directing the exhaust away from it, preventing it from detecting & operating normally (not likely), OR there may be a fault in the heating element circuit (more likely). It comes off the purple/yellow circuit (can't remember which fuse) which also feed A LOT of other things and runs around the front of the radiator to the R side near the battery where it drops down by the engine mount & goes to the sensor. Make sure you have good power & ground to the appropriate terminals in the connector, and test for a signal voltage. Then, using the old & the new sensors, trace the fault..." by Steve
miesk5 Notes;
check purple/orange (P/O) for 12v w/engine running in this Wiring Diagram in 94 Bronco 5.8
94 FUEL PRESSURE SPEC KOEO 35-45 PSI & Eng Running 30-45 PSI
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=4907
Ground Location Diagram, Engine Area in a 95; G100. G101
Source: by SeattleFSB
DTC 41, 42, 91, 92, 136, 137,139, 144, 171, 172, 173, 175, 176, 177 & some Possible Causes for Rich & Lean HEGO The engine temperature must be greater than 50°F (10°C) to pass the KOEO Self-Test and greater than 180°F (82°C) to pass the KOER Self-Test. To accomplish this, the engine should be at normal operating temperature
Source: by Ryan M (Fireguy50)
All of the following items will cause a HEGO code:
• Check engine oil for fuel contamination.
• Check fuel pressure.
• Check fuel systems ability to hold pressure for 60 seconds.
• Engines general condition.
• Fuel injectors (leaky, stuck, dirty).
• Secondary Air Injection (AIR) system.
• PCV / Hose stuck or blocked.
• Vacuum leaks.
• Fuel Injector O-Rings.
• CANP.
• MAP/MAF sensor.
• Ignition Coil Failure.
• Wiring harness general condition.
• Old HEGO sensors (should be replaced every 60,000 miles).
at
http://web.archive.org/web/20110414070916/http://fordfuelinjection.com/index.php?p=31
http://web.archive.org/web/20110414070916/http://fordfuelinjection.com/index.php?p=31
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DTC 632 - OD cancel switch not changing state. "...During the KOER test, AFTER the initial recognition code is generated, the brake pedal must be applied, the OD switch must be turned off and then back on and finally the "goose" test must be performed. This code is generated when the person performing the KOER test fails to deactivate and reactivate the OD cancel switch at the end of the shift lever. It does NOT indicate a problem unless the switch WAS INDEED deactivated and reactivated and the code still came up. (Computer needs to know if the tranny is in OD or not
