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Old 07-17-2021, 04:25 PM   #1
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Check engine light - 2004 Adventurer 35u Workhorse

We have a 2004 adventurer work horse. 35u. Our check engine light came on and the code said it was a knock sensor. How expensive are these to replace
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Old 07-18-2021, 06:29 PM   #2
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Based on my recent experience with O2 sensors, it is a matter of locating the bad sensor, and then locating a replacement sensor. My struggle was getting the old one out. Like a couple of the people in YouTube videos, I had to use a propane torch to heat the base so I could loosen the sensor enough to get it unscrewed; in the end, I did not use the special O2 sensor socket, only a 7/8" open-ended wrench. The mechanics wanted way too much to do the job I could do in a little more time.

So, the simple answer is, you can do it yourself barring any extreme access issues. Watch a few different YouTube how-to videos, buy the best sensor (OEM), and get to work.
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Old 07-21-2021, 08:04 PM   #3
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knock sensors are an easy change on the 8.1.
you can test them without removing them.
with out looking I think 100 to 120 test is good. open or shorted bad.
Read obd2 check eng light #1 is driver front, #2 pass rear.
sometimes it is just the plug connection.
auto parts stores sell 1 foot of wire with the plug attached. workhorse is a single wire plug.
If I missed the boat, someone will jump in with the right info.


good luck
TJ
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