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Buddy
Buddy, Technician
Category: Heavy Equipment
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Experience:  25 years experience
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Kenworth..an N14 cummins engine and it is showing fault code 121

Customer Question

I have a kenworth truck with an N14 cummins engine and it is showing fault code 121 could you please tell me what that code indicates
Submitted: 7 years ago.
Category: Heavy Equipment
Expert:  Buddy replied 7 years ago.

Hi there . This code is engine position sensor. This sensor is on left side of engine . Below the air compressor and above the oil pump. It is pretty tough to get out without the correct socket on a N14. This is pretty common sensor to go bad on a N14. Hope this helps you. If you have anymore questions just ask. Thanks

Buddy, Technician
Category: Heavy Equipment
Satisfied Customers: 730
Experience: 25 years experience
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Expert:  Don replied 7 years ago.



121
Yellow
S021
10
No engine speed signal detected at one pair of pins, either pins 1 and 15 or pins 11 and 14 of sensor harness connector. None on performance.

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