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Ask Ron Your Own Question
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Speedometer not working periodatly and check engine light

Customer Question

speedometer not working periodatly and check engine light on
JA: Does the light stay on, or does it blink?
Customer: stays on
JA: What is the model/year of your Ford?
Customer: 1997 mercury sable gl
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: yes just researching so far I thought about replacing the speedometer cluster but haven't yet
JA: Anything else you think the mechanic should know?
Customer: i just bought it for my daughter and don't know how long the problem has existed
Submitted: 1 year ago.
Category: Ford
Expert:  Chad Farhat replied 1 year ago.

Hi, I'm Chad ,Welcome To JustAnswer, I'm reviewing your question and I will be be posting a replay ASAP

no dont change sensor yet, there is an input speed sensor we need check first, if that is good then cluster need replacement

Expert:  Chad Farhat replied 1 year ago.

in the diagram i sent you , the location of the C1040 ( Turbine shaft speed sensor )

check this first, than if it is good , then replace cluster

these are the 2 common causes about this problem.

Please let me know

Thank You

Chad Farhat

ASE Certified Technician