Mr Diesel - Truck Repair Shop - Mississauga, GTA

08/11/2026

Annual Safety Due Soon?
5900 Dixie Rd, Unit 13, Mississauga
📞 905-677-7663
🕘 Monday–Saturday, 9:00 AM–6:00 PM

07/01/2026

🚛 Another day, another derate.

If you're an owner-operator, dispatcher, or small fleet owner, you already know the feeling in your gut when the dash lights up: reduced power, forced regen, or a DEF/NOx/DPF fault code.

It's never just an "engine light." It's:

→ A load that doesn't get delivered
→ A driver stuck on the shoulder waiting on a tow
→ A shop backlog that turns a 2-hour fix into a 2-day wait
→ A customer asking why their freight is late — again

Emissions system downtime doesn't show up as a repair bill. It shows up as lost income. Missed loads. Angry dispatch calls. Drivers who feel like they're fighting the truck instead of driving it.

And the frustrating part? A lot of these derates trace back to the same handful of culprits — a failing sensor, a clogged DPF, a software hiccup — that get missed because nobody had time to actually diagnose it properly before throwing parts at it.

Techs: you know exactly what we're talking about.
Fleet owners: you've felt it in the P&L.
Drivers: you've felt it in your paycheck.

What's the worst derate story you've got? Drop it below — let's compare notes.

06/30/2026

at your service

06/20/2026

Yellow Sticker Expiring Soon?
Plan repairs before it becomes urgent.
Truck & trailer inspections in Mississauga.
Call: 905-677-7663

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01/24/2026

12/31/2025

Happy New Year 2026

12/27/2025

Broken Air Compressor – Freightliner / Cummins Engine
This is what a failed engine-driven air compressor looks like after a catastrophic breakdown on a Freightliner with a Cummins engine.
When an air compressor fails this way, the damage often goes far beyond “no air pressure.” Potential consequences include:
Metal debris entering the gear train
Damage to accessory drive gears
Contamination of the air system with oil or metal particles
Loss of braking air pressure leading to an immediate roadside shutdown
Risk of secondary engine damage if the failure is not caught early
Likely root causes include:
Internal bearing failure due to oil starvation
Excessive engine blow-by contaminating the compressor
Overheating from restricted oil supply or cooling issues
High mileage wear with delayed maintenance intervals
What should be done next:
Do not install a new compressor without inspecting the gear housing
Flush the entire air system to prevent valve and dryer failures
Inspect accessory drive gears for wear or missing teeth
Address the root cause (oil pressure, blow-by, maintenance history) before returning the truck to service
Ignoring these steps often results in repeat failures and significantly higher repair costs.
If you are dealing with air system failures, compressor issues, or unexpected breakdowns on Freightliner, Cummins, or other heavy-duty platforms, contact Mr Diesel Inc. Our team specializes in proper diagnostics, root-cause repair, and getting trucks back on the road the right way the first time.
Message or call 905-677-7663 today for professional diesel repair and breakdown support.

12/13/2025

First come, first served