SES light when gas tank gets empty

My wifes 98 TP gets a SES light when the gas tank nears empty and goes away after she refills. Haven't had a chance to check which code its getting but its got me wondering why??
Any ideas?:confused:

Reading the code would likely tell you. My guess is it is one of the emissions codes, such as the EVAP canister, that gets flaky when you are low on gas.

As a side note, it is not recommended to run the take low. The fuel pump uses the gas as a form of a coolant. Running low on gas can cause your fuel pump to run hot, causing premature failure. It's a several hundred dollar part and isn't the easiest to get to...

Thanks for the reply, I was leaning towards a evap problem. One of these days I'll get the error code read.

Did a scan and got these DTC but it doesn't make any sense as to why (yet) these codes are pulled. :confused:

Check Engine Light: OFF

Time Since Codes Cleared: ---
Distance Since Codes Cleared: ---
Drive Cycles Since Codes Cleared: ---

Confirmed Diagnostic Trouble Codes:
Code: Description:
P0172 Fuel Trim System Rich Bank 1
P0420 Catalyst System Efficiency Below Threshold (Bank 1)

Possible Diagnostic Trouble Codes:
Code: Description:

--------: EMISSION TEST STATUS :--------
Emission Status: <SELECT DATE>
Vehicle Model Year: <SELECT>

OBD Compliant: Yes
Misfire Monitoring: Complete
Heated Catalyst Monitoring: Not Supported
Comprehensive Component Monitoring: Complete
Catalyst Monitoring: Complete
Fuel System Monitoring: Complete
Evaporative System Monitoring: Complete
Secondary Air System Monitoring: Not Supported
EGR System Monitoring: Complete
Oxygen Sensor Monitoring: Complete
Oxygen Sensor Heater Monitoring: Complete
A/C System Refrigerant Monitoring: Not Supported

--------: FREEZE FRAME DATA :--------
Generated by DTC code: P0172

Fuel System Status Bank 1: CL-1
Calculated Engine Load: 11.8 %
Engine Coolant Temperature: 189 °F
Short Term Fuel Trim Bank 1: -4.7 %
Long Term Fuel Trim Bank 1: -10.9 %
Manifold Absolute Pressure (MAP): 17.7 in Hg
Engine Speed: 1385 RPM
Mass Air Flow Rate: 2.318 lb/min
Throttle Position Angle: 12.9 %