HEADER DEF QUALITY SENSOR for 2015 Freightliner Cascadia

Hello All,
I have a 2015 Freightliner Cascadia with 755k on the ticker. Thankfully I’ve survived my 1st year as an O/o Recently noticed a coolant leak under the drivers side door. Saw that the 1 of the bunk heater lines was leaking. Had a friend of mine cut the lines and loop them. Problem solved temporarily. A few months later starting seeing coolant again in about the same spot. While the truck was getting PM service I had the mechanic check it out. After a pressure test. He informed me that I needed a Def Quality Sensor. Price $1600!! I felt like a baby seal that just got clubbed over the head. Told him that this was gonna have to wait a month or two. The leak isn’t that significant. My question is does it have to be a brand new one? I looked online and saw several on E bay for like $450. Does it matter if it’s new or used? Please provide any and all feed back. It is most appreciated. Thanks in advance.

 

Your truck had a new one when built. It lasted 750,000 miles.
You now have a used one that leaks.
How long will the used one you buy last? 1 day, 1 week another 100,000 miles?
I say buy new, good luck.

Putting a new one on is not required.

 

See heres the thing with used parts. They are USED. Do you know where they came from? How long they were used? If they were cared for? Sure even i use used parts when my hand is forced because of shortages or just needing my rig up NOW not in 6 weeks when parts show up.

But in my experince used parts are like playing russian roulette with your cash. Sure most of the time you will get a decent deal. But as often as not you dont. And when it comes to critcal parts like anything doing with coolant for example. Do you really wanna risk a used part crapping out. Especially when you have a 100+ heat wave in many areas?