[thumpin455]

TRURX7,
I believe you are getting the Diagnostic Trouble Codes for the 1995 3800 Riviera mixed up with those of the 1995 4.0 Aurora. As you know the Riviera and Aurora share the same 2 book set of GM Factory Service Manuals. Book 2 of 2 "Driveability & Emissions" shows a listing of the Riviera DTC's in the front half of section 6E3. Apparently 1995 was a transitional year for the Riv and both OBD I and OBD II DTC's are shown. The 1995 Aurora was OBD I only and a summary of the codes are shown in the back half of section 6E3. The meaning of the former OBD I codes for the Riviera are different than the meaning of the OBD I codes for the Aurora even though the numerical value is the same.

On Aurora: DTC 15 = Engine Coolant Temperature (ECT) Sensor Circuit Open (Low Temperature Indicated); DTC 25 = No Spark Reference (24x) Crank Position Signal from IC Module (low voltage); DTC 60 = Park/Neutral Input with Cruise Control Engaged (trans not in Drive); DTC 117 = Shift "A" Solenoid/Shift "B" Solenoid Circuit Open or Shorted.

On Riviera: DTC P0117 (former DTC 15) = Engine Coolant Temperature Sensor - low temp indicated); DTC P0113 (former DTC 25) = Intake Air Temperature Sensor - high temp indicated.

You may want to get a service manual before throwing parts at it. Multiple codes will take some interpretation. Getting a code doesn't necessarily mean the sensor is bad. May just be the sensor doing it's job and indicating something is out of sequence or high/low value out of design parameters. Code 25 for instance may indicate a bad coil, ICM or even a faulty PCM. The FSM details troubleshooting for each DTC. By the way, is your engine running rough, shifting hard, or has it suddenly downshifted while cruising on the highway?? Let us know how it is running