FixingDaily
Active Member
- Joined
- September 17, 2010
- Messages
- 52
- Reaction score
- 1
- City, State
- Boise, Idaho
- Year, Model & Trim Level
- 94 Explorer XLT
Hey Guys,
My 94 Explorer with the 4.0 6-Cyl, MFI motor is having the CEL act up again. Last time I had this many codes in the CM memory test (2011), I started down the line of recommended tests, replacements etc. After considerable time and dollars, all was fixed by replacing the PCM with one out of a twin "94". After reviewing my old posts, most of the codes are similar, but are dealing with different banks, etc. I am close to just ordering a replacement PCM before starting down the investigations road again. Before I do that, I thought maybe I should run this list by the helpful folks on this forum to see if you have any other ideas. I should say I my daughter and I have been driving this Explorer back and forth to her university about 3 hours each way at 80 MPH (yeah for Idaho) and it is running very strong. Here are the codes:
KOEO
335 (O) Pressure Feedback EGR Sensor Voltage Higher Or Lower Than Expected During KOEO
KOEO CM Memory Codes:
124 (M) TP voltage was higher than expected
176 (M) Oxygen sensor not switching - system is or was lean Left or Front HO2S
177 (M) Oxygen sensor not switching - system was rich Left or Front HO2S
336 (O,R,M) PFE sensor signal is/was high
337 (O,R,M) EGR feedback signal is/was high
KOER
336 (O,R,M) PFE sensor signal is/was high
Thank you in advance for any help you can give on clearing this up.
My 94 Explorer with the 4.0 6-Cyl, MFI motor is having the CEL act up again. Last time I had this many codes in the CM memory test (2011), I started down the line of recommended tests, replacements etc. After considerable time and dollars, all was fixed by replacing the PCM with one out of a twin "94". After reviewing my old posts, most of the codes are similar, but are dealing with different banks, etc. I am close to just ordering a replacement PCM before starting down the investigations road again. Before I do that, I thought maybe I should run this list by the helpful folks on this forum to see if you have any other ideas. I should say I my daughter and I have been driving this Explorer back and forth to her university about 3 hours each way at 80 MPH (yeah for Idaho) and it is running very strong. Here are the codes:
KOEO
335 (O) Pressure Feedback EGR Sensor Voltage Higher Or Lower Than Expected During KOEO
KOEO CM Memory Codes:
124 (M) TP voltage was higher than expected
176 (M) Oxygen sensor not switching - system is or was lean Left or Front HO2S
177 (M) Oxygen sensor not switching - system was rich Left or Front HO2S
336 (O,R,M) PFE sensor signal is/was high
337 (O,R,M) EGR feedback signal is/was high
KOER
336 (O,R,M) PFE sensor signal is/was high
Thank you in advance for any help you can give on clearing this up.