Fer Echegaray
Well-Known Member
Lately there have been several posts about the Check Engine Light (CEL) going off on several STs lately.
Gathering the experience from past posts, it seems that you might get one or more of the following codes:
a) P0171 - Lean on bank 1
b) P0174 - Lean on bank 2
c) P1400 - DPF EGR Sensor Circuit Low Voltage Detected
d) P1401 - DPF EGR Sensor Circuit High Voltage Detected
e) P0401 - EGR Flow Insufficient Detected
f) P0402 - EGR Flow Excessive Detected
For (a) and (b) you most likely have a problem with a vaccum hose, keep reading and you'll find Coastijoe's reply with pics of the hose.
For (c) to (f) codes the solution so far has been to replace the DPFE (and only 1 instance I found that EGR valve was also replaced).
For what I've read here, you only need the EGR valve if your Trac is rough at idle, or has stalled when you accelerate, otherwise the DPFE replacement should take care of the problem.
The part number for the DPFE is (please double-check it before buying):
F77Z-9J460-AB for Job 1 STs
4U7Z-9J460-AA for Job 2.
Replacement takes 15 minutes and can be done by hand.
The following picture, which I took from ToddZ's library shows the location of both the DPFE and the EGR.
[Broken External Image]:
That's it, I hope this is helpful in a 'search' when anyone else gets the infamous CEL...
Gathering the experience from past posts, it seems that you might get one or more of the following codes:
a) P0171 - Lean on bank 1
b) P0174 - Lean on bank 2
c) P1400 - DPF EGR Sensor Circuit Low Voltage Detected
d) P1401 - DPF EGR Sensor Circuit High Voltage Detected
e) P0401 - EGR Flow Insufficient Detected
f) P0402 - EGR Flow Excessive Detected
For (a) and (b) you most likely have a problem with a vaccum hose, keep reading and you'll find Coastijoe's reply with pics of the hose.
For (c) to (f) codes the solution so far has been to replace the DPFE (and only 1 instance I found that EGR valve was also replaced).
For what I've read here, you only need the EGR valve if your Trac is rough at idle, or has stalled when you accelerate, otherwise the DPFE replacement should take care of the problem.
The part number for the DPFE is (please double-check it before buying):
F77Z-9J460-AB for Job 1 STs
4U7Z-9J460-AA for Job 2.
Replacement takes 15 minutes and can be done by hand.
The following picture, which I took from ToddZ's library shows the location of both the DPFE and the EGR.
[Broken External Image]:
That's it, I hope this is helpful in a 'search' when anyone else gets the infamous CEL...
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