4×4 light came on

270,000 MILES • V8 • AUTOMATIC
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JAMI51
  • MEMBER
  • 1 POST
I bought the SUV listed above from a man who told me the four-wheel drive didn't work. When I bought it the light was on for the 4 by 4 and the two wheel drive was on also. Also the speedometer would not go past 20 miles an hour. After driving it for a week both of the lights went off in the speedometer started to work all at the same time. It's been 8 months since I bought it and today both lights came back on and the speedometer won't work. This is quite confusing I have no idea what it could be. Does any of this make sense? Have I been driving it all day in four-wheel drive? Thank you for any help you can give me.
Oct 4, 2019 at 1:07 PM
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BMDOUBLE
  • ✓Experienced Mechanic
  • 1,139 POSTS
The 4 wheel drive system and the speedometer rely on the output shaft speed sensor for operation. I've attached the pinpoint tests for the output shaft speed sensor. Check out the diagrams (Below). Let us know what happens and please upload pictures or videos of the problem.
Oct 5, 2019 at 1:15 PM
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