If your 2002 Mercury Sable's transmission won't go into gear, it could be due to several issues, such as low Transmission Fluid, a faulty transmission solenoid, or a problem with the shifter linkage. First, check the transmission fluid level and condition; if it's low or dirty, consider changing it. If the fluid is fine, you may need to inspect the transmission components or take the vehicle to a mechanic for a diagnostic. It's essential to address transmission issues promptly to avoid further damage.
Replace your transmission pump or get a new transmission.
That is a "Check transmission light"
When the transaxle light is blinking on a 2001 Mercury Sable, it means there are some transmission issues that need to be addressed immediately. This condition may lead to locking of the transmission on second gear.
The O/D OFF warning light in the bottom left of your tachometer on your 1999 Mercury Sable means that the ( OVERDRIVE IS OFF ) * that's the " top gear " of your automatic transmission
On a 2001 Mercury Sable : That's your " CHECK TRANSAXLE " ( transmission ) warning light The warning light is located in the bottom of the tachometer on the left side . If the light stays on take the vehicle in for servicing
If the light is on ( not flashing ) that means that the overdrive has been switched off ( the 4th gear of your automatic transmission )
it is to select "overdrive" gear in transmission. mainly for highway driving. if you have both "D" and "D" with circle around it, use "D" for most driving needs.
Check fuses Check wiring harness at transmission for corrosion or loose wiring
Solenoid in trans
Sounds like you have a bad Vehicle Speed Sensor.
The transmission defaults to second gear when it detects a malfunction.The transmission defaults to second gear when it detects a malfunction.
The one on the tachometer that is surrounded by a gear is the check transaxle warning light