What Is the 2593754C91 Exhaust Gas Temperature Sensor?
The 2593754C91 exhaust gas temperature (EGT) sensor is a critical emissions control component designed for International trucks equipped with MaxxForce diesel engines. This sensor monitors exhaust gas temperatures in real time and sends precise voltage signals to the engine control unit (ECU), enabling proper management of the diesel particulate filter (DPF) regeneration cycle, selective catalytic reduction (SCR) system, and exhaust gas recirculation (EGR) valve.
As a direct-fit OEM replacement for Navistar/International applications, the 2593754C91 EGT sensor ensures your heavy-duty truck meets EPA emissions standards while protecting expensive aftertreatment components from overheating damage.
Key Functions of the 2593754C91 EGT Sensor
1. DPF Regeneration Control
The sensor measures exhaust temperatures before and after the diesel particulate filter. When soot accumulation reaches a threshold, the ECU uses temperature data from the 2593754C91 sensor to initiate and regulate DPF regeneration — the process of burning off trapped particulate matter at high temperatures.
2. SCR System Optimization
For trucks equipped with selective catalytic reduction (DEF/urea injection), the exhaust gas temperature sensor ensures the catalyst is at the correct operating temperature (typically 250°C–450°C) before injecting diesel exhaust fluid, maximizing NOx conversion efficiency.
3. Component Protection
By continuously monitoring exhaust temperatures, the 2593754C91 sensor prevents catastrophic overheating of the DPF, DOC (diesel oxidation catalyst), and turbocharger, saving fleet operators thousands in repair costs.
4. Emissions Compliance
Accurate temperature readings are essential for meeting EPA 2010 and Euro VI emissions regulations. A faulty EGT sensor can cause your International truck to fail emissions inspections.
Compatible Vehicles & Engines
The 2593754C91 exhaust temperature sensor is designed for the following applications:
表格
| Engine Model | Vehicle Applications | Mounting Position |
|---|---|---|
| MaxxForce DT | International DuraStar, WorkStar | Pre-DPF / Post-DPF |
| MaxxForce 9 | International WorkStar, TranStar | SCR Inlet |
| MaxxForce 10 | International ProStar, LoneStar | Turbo Outlet |
| MaxxForce 11 / 13 | International ProStar+, PayStar | DPF Inlet / Outlet |
Cross-reference part numbers:
- 2593754C90
- 2593754C92
- AP63484
- 5001042414
Common Failure Symptoms
A failing 2593754C91 EGT sensor will typically trigger one or more of these warning signs:
Dashboard Warning Lights
- Check Engine Light (CEL) illuminated
- DPF warning lamp active
- Reduced power / derate indicator
Performance Issues
- Engine enters limp mode with limited power output
- Poor fuel economy and increased DEF consumption
- Rough idle or hesitation during acceleration
DPF Regeneration Problems
- DPF fails to complete regeneration cycle
- Frequent or incomplete regens leading to soot buildup
- “DPF Full — Parked Regen Required” message
Fault Codes
The most common diagnostic trouble codes (DTCs) associated with a bad 2593754C91 sensor include:
- P242A: Exhaust Gas Temperature Sensor Circuit (Bank 1, Sensor 3)
- P242B: Exhaust Gas Temperature Sensor Circuit Range/Performance
- P246E: Diesel Particulate Filter Restriction – Soot Accumulation
- SPN 3711 / FMI 2: Aftertreatment #1 Outlet Temperature Sensor Circuit
Why Choose WJIECO 2593754C91 EGT Sensors?
When replacing your exhaust gas temperature sensor, quality matters. WJIECO premium EGT sensors offer:
✅ IATF 16949 Certified Manufacturing
All WJIECO sensors are produced in IATF 16949 certified facilities, ensuring automotive-grade quality and consistency — the same standards used by OEM manufacturers.
✅ Fast Response Time
Our 2593754C91 replacement sensor features a rapid-response thermistor element with <100ms response time, providing accurate temperature readings even under rapid load changes.
✅ Wide Temperature Range
Operating range: -40°C to +900°C (-40°F to +1652°F), engineered to withstand the extreme heat of heavy-duty diesel exhaust systems.
✅ Direct Plug-and-Play Installation
Factory-matched 4-pin connector with OEM-quality wiring harness — no splicing, no modifications. Installs in 15–30 minutes with basic hand tools.
✅ Corrosion-Resistant Construction
Stainless steel probe with high-temperature ceramic insulation and double-wall housing for long service life in harsh under-hood environments.
✅ OEM-Level Accuracy
Calibrated to match original equipment specifications, ensuring seamless communication with the ECU and proper DPF/SCR system operation.
Installation Guide: How to Replace the 2593754C91 Sensor
Tools Needed
- 22mm wrench or EGT sensor socket
- Penetrating oil (PB Blaster or WD-40)
- Dielectric grease
- Safety glasses and heat-resistant gloves
Step-by-Step Installation
Step 1: Safety First
Allow the exhaust system to cool completely (minimum 2 hours after engine shutdown). Exhaust components can reach 600°C+ and cause severe burns.
Step 2: Locate the Sensor
Find the faulty 2593754C91 sensor mounted in the exhaust pipe — typically before or after the DPF canister. Follow the wiring harness to the electrical connector.
Step 3: Disconnect the Electrical Plug
Depress the locking tab on the 4-pin connector and gently pull apart. Inspect the connector for corrosion or damage.
Step 4: Remove the Old Sensor
Spray penetrating oil on the sensor threads and let it sit for 5–10 minutes. Use a 22mm wrench or specialized EGT socket to turn the sensor counterclockwise.
Step 5: Prepare the New Sensor
Apply a small amount of anti-seize compound to the threads of the new WJIECO 2593754C91 sensor (avoid getting anti-seize on the sensing tip).
Step 6: Install the New Sensor
Thread the new sensor into the exhaust bung by hand, then tighten to 20–25 Nm (15–18 ft-lbs) of torque. Do not over-tighten — this can damage the threads or the sensor element.
Step 7: Reconnect the Wiring
Plug the electrical connector back in until you hear a click. Apply dielectric grease to the connector to prevent moisture intrusion.
Step 8: Clear Fault Codes
Use an OBD-II scan tool to clear stored DTCs. Start the engine and verify that the check engine light stays off.
Maintenance Tips for Extended Sensor Life
To maximize the lifespan of your 2593754C91 EGT sensor:
- Use quality diesel fuel — low-quality fuel with high sulfur content can contaminate the sensor element
- Perform regular DPF regens — don’t let the filter become overly full, as this causes extreme temperature spikes
- Inspect wiring harnesses during routine maintenance — look for frayed insulation or loose connections
- Avoid water intrusion — ensure the connector seal is intact, especially after pressure washing the engine bay
- Replace in pairs — if one EGT sensor fails, the others are likely nearing the end of their service life
Frequently Asked Questions
Q: How many EGT sensors does my MaxxForce engine have?
Most MaxxForce DT/9/10 engines have 3–4 exhaust gas temperature sensors: pre-turbo, pre-DPF, post-DPF, and pre-SCR. The 2593754C91 is commonly used in the pre-DPF and post-DPF positions.
Q: Can I drive with a bad EGT sensor?
Driving with a faulty 2593754C91 sensor is not recommended. The engine will likely enter derate mode, and prolonged operation can cause permanent DPF damage or turbocharger failure.
Q: How long does an EGT sensor last?
Under normal operating conditions, a quality EGT sensor like the WJIECO 2593754C91 should last 100,000–150,000 miles. Severe duty cycles, excessive idling, or fuel contamination can shorten service life.
Q: Is the 2593754C91 sensor compatible with all MaxxForce engines?
The 2593754C91 is specifically designed for MaxxForce DT, 9, and 10 engines in International truck applications. Always verify your OEM part number before ordering.
Shop WJIECO 2593754C91 EGT Sensors
Don’t let a faulty exhaust temperature sensor sideline your truck. WJIECO offers premium-grade 2593754C91 exhaust gas temperature sensors at competitive prices, backed by our 12-month warranty and dedicated technical support.
Why fleet managers trust WJIECO:
- OEM-equivalent performance and fitment
- IATF 16949 certified manufacturing
- Bulk pricing available for fleet operations
- Fast shipping from US-based warehouses
- Expert technical support team
Ready to replace your 2593754C91 EGT sensor? Browse our full catalog of exhaust temperature sensors or contact our sales team for volume pricing and cross-reference assistance.
