Diesel engines are built to work harder and last longer than their gasoline counterparts, but they require specialized knowledge, equipment, and parts to service correctly. Our technicians understand the unique demands of diesel powertrains, from high-pressure fuel injection systems and turbochargers to emissions controls and glow plug systems, and have the tools to diagnose and repair them accurately.
Signs Your Vehicle Needs This Service
- Excessive black, white, or blue smoke from the exhaust: each color indicates a different type of fuel or combustion problem
- Loss of power or sluggish acceleration even under light loads, which can indicate fuel pressure problems, a failing turbocharger, or injector wear
- Diesel knock or unusual engine noise that has developed or worsened over time
- Difficulty starting in cold weather or extended cranking before the engine fires
- Check engine light illuminated with codes related to fuel pressure, injectors, or the diesel particulate filter
- Diesel exhaust fluid warning light or reduced power mode activated
Diesel Repair
Comprehensive Diesel Diagnostics
Diesel systems are complex, and accurate diagnosis requires equipment that can communicate with diesel-specific engine control modules and read manufacturer-level fault codes. Our technicians connect your vehicle to professional-grade diagnostic tools and perform targeted testing of fuel pressure, injector operation, and turbocharger function.
Fuel Injector Service & Replacement
Diesel fuel injectors operate under extreme pressure and are critical to combustion efficiency, power output, and fuel economy. Worn or clogged injectors cause rough running, excessive smoke, poor fuel economy, and hard starting. We test injector performance, clean when appropriate, and replace failed units with quality components.
DPF Service
The diesel particulate filter captures soot from the exhaust stream and must periodically regenerate. A DPF that is clogged or failing to regenerate causes power loss, increased fuel consumption, and warning lights. We diagnose DPF issues, perform forced regeneration when appropriate, and replace filters that are beyond service.
Turbocharger Inspection & Repair
A failing turbo can cause dramatic power loss, excessive smoke, and potential engine damage. We inspect turbocharger operation, shaft play, wastegate function, and intercooler connections to identify the source of turbo-related symptoms and repair or replace components as needed.
Glow Plug Replacement
Glow plugs preheat diesel combustion chambers before and during startup, and worn plugs make cold starting difficult or impossible. We test each glow plug individually and replace failed units along with any damaged control relay components to restore reliable cold-weather starting.
DEF System & SCR Service
Selective catalytic reduction systems use diesel exhaust fluid to reduce nitrogen oxide emissions. Failures in this system trigger warning lights, performance restrictions, and compliance issues. We diagnose DEF quality sensors, injectors, the SCR catalyst, and associated wiring to restore proper emissions system function.
More Services
Why Choose APS Automotive
Honest Diagnostics
We tell you exactly what's wrong and what it takes to fix it. Nothing more, nothing less. No upselling, no surprise charges.
Quality Parts & Warranty
We use only trusted brands and back our work with a solid warranty, giving you peace of mind long after you drive away.
Fast Turnaround
We know you need your vehicle. Our efficient workflow gets you back behind the wheel as quickly as possible without cutting corners.
ASE Certified Technicians
Our 2 ASE-certified technicians bring real expertise. We're also California-licensed smog technicians serving Atascadero since 1992.
Transparent Pricing
You'll receive a detailed estimate before we begin any work. We respect your budget and will never start without your approval.
Clear Communication
No confusing jargon. Just straightforward explanations of what your vehicle needs and why. We're educators, not salespeople.
Ready to Schedule Service?
Request an appointment. We're open Monday through Friday, 7:30am – 5:30pm.
(805) 461-5823