Question about 1999 Nissan Sentra

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Speedometer goes to 0 and trans downshifts

Just driving and the trans will downshift and when you look down the speedo is on 0. when the speedo resumes working the trans will shift back to the higher gear. Replaced speedo sensor to no avaial.

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There are 2 speed sensors on the transaxle. One is for vehicle speed and one is for trans output shaft speed. My guess is that you replaced the one for output shaft speed.

Nissan Scope Technician- 10 years with Nissan

Posted on Oct 29, 2008

  • Nico Jul 26, 2013

    Have not replaced any 1 of the 2,kilometers not counting and show no speed on speedo

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Down at the pressure lever on the front of the trans, loosen off the cable retaining nuts so there is a little slack in the cable.
then start taking the slack out of the cable a little bit at a time;
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1 Answer

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most cars including yours, you have a speed snesor on the gearbox, which tells the computer (ecu) and transmission how fast you are going....the fact that you have included that the speedo is erratic, is telling me that the sensor needs to be replaced, as it is telling the ecu (which tells the speedo) the incorrect signal as well as the transmission......hopefully, easy fix

this reminds me that cars are like humans IN A WAY, the same symptoms may lead to a cause, the car not downshifting and the erratic speedo are the symtoms, just like a runny nose and cough are symptoms, and the sensor is the cause of the faults, where the cold is the cause of the faults in us....how cool

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