Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×

Thread Tools Search this Thread Display Modes
Old 07-17-2021, 04:25 PM   #1
Winnebago Watcher
Join Date: Jul 2021
Posts: 1
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
Dandc is offline   Reply With Quote
Old 07-18-2021, 06:29 PM   #2
Winnebago Owner
Join Date: Apr 2014
Location: Texas
Posts: 84
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.
Butch and Peggy
N.Central TX; 2000 Itasca Suncruiser 32V; Workhorse P-32 Chassis; Chevy Vortec 7400 L21 w/Banks Pwr Sys; Steer Safe; Springs/Airbags front; Timbren Suspension kit rear; Onan 5K
peggwn is offline   Reply With Quote
Old 07-21-2021, 08:04 PM   #3
Winnebago Camper
thunderjet's Avatar
Join Date: Mar 2013
Location: winter in Fl. 34957 summer Mi.48755
Posts: 20
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
2005 Winnebago Adventurer 35A
Toad 2016 Equinox
W-22 GM 8.1 gas
thunderjet is offline   Reply With Quote

light, workhorse, vent, engine, adventurer

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
ABS light on and then check engine light wbnjr Winnebago Class B Motorhomes 0 04-20-2021 01:34 PM
Via - Mercedez turbo diesel 3500 Sprinter check engine light Paaymans General Maintenance and Repair 9 11-28-2018 06:55 PM
check engine light jvcardyn Winnebago Class A Motorhomes 3 08-17-2018 07:13 AM
check engine light ljohio General Maintenance and Repair 6 10-11-2006 05:45 AM
Check engine light fixed, more white knuckles John_Canfield General Maintenance and Repair 9 06-12-2005 06:00 AM

» Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by Winnebago Industries or any of its affiliates. This is an independent, unofficial site.

All times are GMT -6. The time now is 04:34 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.