Isuzu Trucksrepair & diagnostics
Isuzu NPR and NQR medium-duty trucks run the 4HK1 and 6HK1 engines and are the workhorse of last-mile delivery. Their DPF and SCR systems are the most common derate source — we force regens, clear DEF faults, and fix no-starts.
Shop & mobile service for Isuzu Trucks
Connect the right laptop, pull active and inactive codes, and read live data before recommending parts.
Forced (parked) regens, SCR/DEF dosing faults, NOx sensor diagnosis, and derate clearing.
Slack adjusters, chambers, relay valves, drums, linings, and ABS blink-code reading.
Alternators, batteries, parasitic draws, 7-way, and crank/no-start diagnosis.
Air ride ride height, air bags, leveling valves, and walking-beam service.
Preventative maintenance A/B/C and annual DOT inspections that leave you compliant.
Commercial tire sales, mounting, balancing, wheel seals, bearings, and hubs.
Lights, brakes, suspension, landing gear, doors, and reefer refrigeration troubleshooting.
The faults we see most
The most common derate source on Isuzu medium-duty — we diagnose soot load and dosing.
Fuel, cranking, and ECM command paths on Isuzu 4HK1/6HK1.
Code reading and forced regens to clear aftertreatment faults.
Isuzu Trucks engine platforms
We connect the right diagnostic laptop for each engine platform Isuzu Trucks runs, pull the fault codes, and read live data before recommending a single part. Below are the engines we service on Isuzu Trucks.
Read the diagnostic path
MTG Shops does not perform engine overhauls or major component rebuilds in-house. We have quality partners in every market who specialize in Isuzu Trucks overhauls and in-frame / out-of-frame rebuilds. We handle the diagnosis, get the truck to the right specialist, and coordinate the handoff. You get an honest answer about what we fix and what goes to a trusted partner.
Get a bay time and a straight estimate.