Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSSAAB19999-3 BASE, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SELF-DIAGNOSTICS - TRIONIC T7 FUEL CONTROL SYSTEMDIAGNOSTIC TESTSDTC P0116: ENGINE COOLANT TEMPERATURE (ECT) SENSOR PERFORMANCE PROBLEM
1999 Saab 9-3 Base, 2D Hatchback, Automatic
DTC P0116: Engine Coolant Temperature (ECT) Sensor Performance Problem
1999 Saab 9-3 Base, 2D Hatchback, AutomaticSECTION DTC P0116: Engine Coolant Temperature (ECT) Sensor Performance Problem
NOTE:
DTC P0116 indicates that ECT value received by ECM was compared to a calculated substitute value and found to be at least 68°F (20°C) below or 118°F (48°C) above normal range.
- Check coolant for proper level and concentration. Check thermostat operation and ensure that cooling system is working properly. If no cooling system problems were found, go to DTC P0117-P0118: ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT . If problems were found, repair cooling system. If referred here from DTC P0125, go to next step. Otherwise, go to step 3.
- Ensure that both intake air and coolant temperatures exceed 50°F (10°C). Start engine and allow it to idle for at least 4 minutes. Check scan tool display. If OK is displayed, use scan tool to clear all system DTCs. If NOT READY is displayed, back up to INITIATING DIAGNOSTICS on scan tool and retest. If DTC P0125 is still present, substitute known good ECM and retest system. See ENGINE CONTROL MODULE (ECM) under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article.
- Measure external cylinder head temperature with a thermometer. Compare with temperature displayed on scan tool. Check readings when engine is both cold and hot. Readings should not vary more than 50°F (10°C). If readings are as specified, Clear all system DTCs. If readings are not as specified, problem is still present.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.