DPF and DEF is another complication completely. It's pretty bad when the exhaust system cost as much or more than the engine... The facility I am at currently we take care of the "transit" fleet. We have three Freightliner 50 passenger busses with ISC engines and they have about 200,000 miles on them now. The exhaust systems have been working normally up until about three weeks ago and all three of them have been out of service one right after the other for new doser valves, DEF pumps failing, sensors failing, bad level sensor causing power reduction down to three MPH to get them back into town. These units run between the 6 towns driving anywhere between 10 miles and as far as 50 miles per trip. Do the math at 3 MPH when it fails...
Average part prices range from $150 to $950 depending on what failed. The computer software is an annual subscription fee of $1000. All in the name of cleaner air... Let's think about that for a minute...Lets see we trap the "bad stuff" in a filter (DPF: Diesel Particulate Filter) using a chemical (DEF: Diesel Exhaust Fluid) by a chemical reaction, which is then periodically removed to be cleaned for a fee by a local dealer in their oven to cook the trapped material out of the filter to put it where...Back in the air...
What was that saying about the definition of insanity?
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