Multiple Diagnostic Codes
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Joined: Nov 2013
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Multiple Diagnostic Codes
1997 F250 throwing multiple codes. I recently purchased the truck with a 7.5 460. After driving it for a few minutes the CEL comes on. It seems to either idle really high or so low that it dies. I did find a vacuum leak at the PCV and fixed it but the CEL still comes on. I sprayed carb cleaner around the engine bay and can't seem to find anymore leaks. The light does reset after turning the engine off and back on but then returns while driving. Any help is much appreciated. -Walt
Codes are:
PO121- Closed throttle position
PO172- EGO not switching Lean exhaust bank 1
PO173- EGO not switching Rich exhaust bank 1
PO327- EGR (EVP)-PFE-DPFE signal too low
PO332- EGR valve not opening
PO542-Fuel pump circuit open ECA to ground
Codes are:
PO121- Closed throttle position
PO172- EGO not switching Lean exhaust bank 1
PO173- EGO not switching Rich exhaust bank 1
PO327- EGR (EVP)-PFE-DPFE signal too low
PO332- EGR valve not opening
PO542-Fuel pump circuit open ECA to ground
Senior User
Joined: Dec 2014
Posts: 348
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Test your tps with a multi meter set to ohms
Replace your o2 sensors
Check your egr valve with a vacuum tester if it opens and closes fine replace the sensor
Check all your wiring for your fuel pump for breaks or grounded wires
Replace your o2 sensors
Check your egr valve with a vacuum tester if it opens and closes fine replace the sensor
Check all your wiring for your fuel pump for breaks or grounded wires
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