Hi all,
I recently got 100% full dpf see dealer warning. I connected my AlfaOBD to force a regen but it would shut down after about 5 minutes due to a cat temp circuit high P0428
the graph showed the cat temp steady around 630c then a straight shot up to 999.9c and shed idle down and quit the regen
instead of running out to replace the sensor at $200 cdn a friend advised to clean the egt in the manifold as this soots up and can mess up the cat temp sensor reading.
so I pulled off the passenger side plastic wheel well liner and I was staring right at it. You can see in the attached image the sensor above the dpf going into the manifold.
I soaked this with wd40 and got it quite easily (and I'm at 258,000km) I put a red solo cup with diesel and soaked it for at 30 minutes, wiped it off, hit it with the air nozzle and re-installed.
for good measure I put a high speed fan underneath my truck to cool the dpf - my thinking was I might keep it just a few degrees below that point of no return temperature that failed the temp sensor.... crazily enough this worked at holding down the temperature about 20 degrees and it slowed the climb up to 630 degrees significantly
anyway, I forced the regen and this time in completed! within 20 minutes my dpf was down to 10% soot load and all codes cleared.
The best part is this cost me NOTHING! $0.00 !!
obviously I am going to keep an eye on this now but for today my truck is back on the road and my wallet is no less empty as it was before this happened.
I hope this can help others who have had a similar issue
I recently got 100% full dpf see dealer warning. I connected my AlfaOBD to force a regen but it would shut down after about 5 minutes due to a cat temp circuit high P0428
the graph showed the cat temp steady around 630c then a straight shot up to 999.9c and shed idle down and quit the regen
instead of running out to replace the sensor at $200 cdn a friend advised to clean the egt in the manifold as this soots up and can mess up the cat temp sensor reading.
so I pulled off the passenger side plastic wheel well liner and I was staring right at it. You can see in the attached image the sensor above the dpf going into the manifold.
I soaked this with wd40 and got it quite easily (and I'm at 258,000km) I put a red solo cup with diesel and soaked it for at 30 minutes, wiped it off, hit it with the air nozzle and re-installed.
for good measure I put a high speed fan underneath my truck to cool the dpf - my thinking was I might keep it just a few degrees below that point of no return temperature that failed the temp sensor.... crazily enough this worked at holding down the temperature about 20 degrees and it slowed the climb up to 630 degrees significantly
anyway, I forced the regen and this time in completed! within 20 minutes my dpf was down to 10% soot load and all codes cleared.
The best part is this cost me NOTHING! $0.00 !!
obviously I am going to keep an eye on this now but for today my truck is back on the road and my wallet is no less empty as it was before this happened.
I hope this can help others who have had a similar issue
