Sensor Replacement
Modern trucks rely on sensors to manage the engine, emissions and braking. A failed sensor can trigger codes or derates even when the underlying system is sound.
- AvailabilityCalls and messages 24/7
- WhereRoadside, yard or jobsite
- CategoryHeavy-Duty Truck Repair
- On-site repairWhere feasible and safe
About sensor replacement.
Modern trucks rely on sensors to manage the engine, emissions and braking. A failed sensor can trigger codes or derates even when the underlying system is sound.
A mobile mechanic can look at the unit where it stands, whether that is the roadside, a yard or a jobsite. That can avoid a tow and shorten downtime when the fault is suited to on-site work.
Part of Heavy-Duty Truck Repair.
When you might need it.
Any of these is a good reason to call and describe what the unit is doing.
Fault codes naming a sensor
Erratic gauge readings
Derates or limp mode
Intermittent faults
What the service involves.
Confirming the sensor is at fault, not its wiring
Replacing the sensor
Clearing codes and verifying
Checking for related damage
Causes and good habits.
These are possibilities, not a diagnosis. The only way to know is to test the unit.
Possible causes
- Heat, vibration and moisture damage
- Contamination or carbon build-up
- Wiring faults that look like sensor faults
Practical tips
- Test the circuit before replacing the sensor
- Keep connectors clean and secure
What to expect.
Sensors can be misdiagnosed. Testing first avoids replacing good parts.
On-site repair depends on the fault, parts, vehicle condition, safety and service feasibility.
(437) 601-8551Before you call
- Exact location, and direction of travel on a highway
- Truck or trailer type, make and year if known
- What happened and what warnings you see
- Whether the unit is somewhere safe
- A number we can call back
From the first call to the fix.
Call or message
Tell us where the unit is.
Describe the fault
Symptoms, lights, noises, leaks.
Agree the plan
Feasibility and dispatch, discussed honestly.
Diagnose and repair
On site where it is possible and safe.
Services that often go together.
Check Engine Light Diagnostics
A warning light is a symptom, not a diagnosis.
DPF / SCR System Diagnostics
Emissions systems cause many derates on modern diesels.
Engine Diagnostics & Troubleshooting
When a heavy-duty engine derates, stalls, loses power or throws fault codes, finding the actual cause matters more than clearing a light.
Electrical Wiring Repair
Intermittent faults and dead circuits are often wiring problems: chafed harnesses, corroded connectors or loose grounds.
Frequently asked questions.
Can a bad sensor cause a derate?
Yes, depending on the sensor and system. Diagnosis confirms the cause.
How do I request this service?
Call (437) 601-8551 or message us on WhatsApp with your location and the issue. For non-urgent work, use the contact form.
Can every repair be done on site?
No. It depends on the fault, parts, vehicle condition, safety and feasibility.
Stranded on the Road? Let's Talk.
Tell us where your truck or trailer is located and what happened. Contact Fellows to discuss mobile repair options and next steps.
(437) 601-8551Have ready: exact location, truck or trailer type, what happened or what warnings you see, whether the unit is somewhere safe, and a callback number. Timing, dispatch and on-site repair depend on location, availability, the fault, parts and safety.