Engine Diagnostics & Repair
Advanced computer diagnostics combined with decades of hands-on expertise. We find the problem fast — and fix it right the first time.
Free diagnostic consultation · Same-day estimates · Nationwide 12-month/12,000-mile warranty
Comprehensive Engine Diagnostics & Repair
A lit check-engine light shouldn't ruin your week. At St George Auto Repair, we combine state-of-the-art diagnostic equipment with real-world mechanical experience to diagnose your engine accurately and repair it correctly — the first time. As a locally and family owned shop with over 30 years of experience and 13 years right here at this location, we've earned the trust of St George families one repair at a time.
Advanced OBD-II Scanning
We plug into your vehicle's onboard computer system to pull trouble codes, live sensor data, and freeze-frame diagnostics — giving us an accurate picture of what's happening inside your engine.
Certified Technicians
Our ASE-certified mechanics have hands-on experience with domestic, foreign, and hybrid vehicles. As a family owned shop for over 30 years, we've seen it and fixed it — and we treat every customer like a neighbor.
Fast Turnaround
Most diagnostic scans are completed within the hour. For straightforward repairs, same-day service is often available. We respect your time and keep you informed every step of the way.
Nationwide Warranty — 12 Mo / 12,000 Mi
Every engine repair we perform is backed by a nationwide 12-month or 12,000-mile warranty on parts and labor. If you need warranty service while traveling, simply call the 800 number on your receipt to facilitate a claim at any participating shop across the country.
What Engine Issues Do We Diagnose?
From the moment you drive in, our technicians begin gathering clues. Our diagnostic tools and trained eyes work together to locate the root cause — not just mask the symptoms.
- Check engine light diagnosis
- Rough idle & stalling issues
- Loss of power & misfires
- Oil consumption problems
- Overheating & cooling failures
- Fuel system diagnostics
- Emissions failures
- Pre-purchase inspections
How We Diagnose & Fix Your Engine
We follow a proven, systematic 4-step process to ensure nothing is missed and every repair is done right — from the first code scan to your final road test.
Initial Intake & Code Scan
When you bring your vehicle in, our service advisor listens to your concerns and documents symptoms. We then perform a full OBD-II scan to extract all stored and pending diagnostic trouble codes (DTCs) from every module in your vehicle — engine, transmission, ABS, and more.
Deep Analysis & Live Data Review
Not all codes point directly to the failed part. Our technicians review live sensor data — oxygen sensors, MAF readings, fuel trims, coolant temps, and injector pulse — to understand the full picture. We also perform physical inspections of belts, hoses, spark plugs, and visible components.
Transparent Estimate & Repair
We provide a written estimate with a clear breakdown of parts and labor before any work begins. No surprises. Once approved, our technicians perform the repair using quality OEM or equivalent parts and follow manufacturer specifications for torque specs and procedures.
Verification & Road Test
After completing repairs, we clear the trouble codes and perform a thorough road test to verify the fix. We re-scan the vehicle to confirm no new codes have appeared and that all sensors are reading within spec before we hand your keys back.
Engine Repair Services We Offer
From a glowing check-engine light to complete internal engine work, St George Auto Repair has the skills, tools, and parts to keep your engine running strong.
Check Engine Light Diagnosis
We decode every stored and pending DTC and track down the root cause — not just clear the code and send you on your way.
Misfire & Rough Idle Repair
Worn spark plugs, failing ignition coils, dirty injectors, or vacuum leaks — we diagnose and repair the source of misfires and rough running.
Oil Leaks & Consumption
Head gaskets, valve cover gaskets, rear main seals, timing cover gaskets — we find where the oil is going and stop it for good.
Overheating & Cooling System
Faulty thermostats, water pumps, radiators, and blown head gaskets can all cause overheating. We address the source before costly damage occurs.
Internal Engine Repair
Broken timing chains, worn piston rings, damaged valvetrain components — our technicians handle complex internal engine work with precision.
Fuel System Service
Clogged fuel injectors, failing fuel pumps, and dirty throttle bodies rob your engine of performance. We clean, test, and replace as needed.
Not Sure What's Wrong? That's What We're Here For.
Even if you can't describe the problem beyond "it just doesn't feel right," our technicians will take the time to listen, inspect, and explain exactly what's going on. We speak plain English — no mechanic jargon designed to confuse. As a locally and family owned business with over 30 years of experience and 13 years at this location, honest communication is at the core of everything we do.
Call (435) 628-8880 to discuss your symptoms →
30+
Years Experience
Professional-Grade Tools & Technology
Guessing is not a diagnostic strategy. We invest in the same professional tools used by dealerships and OEM engineers — so every repair decision is backed by real data, not assumptions. Our family owned shop has been refining this process for over 30 years, and 13 of those years right here on South Bluff Street.
Snap-on MODIS Ultra
Scan ToolFactory-level bidirectional control. We don't just read codes — we command actuators, run output tests, and graph live sensor data to confirm every repair.
OEM-Level Diagnostics
Multi-brand CoverageWe use manufacturer-specific software for Ford, GM, Dodge, Toyota, Honda, and more — accessing all modules, not just the powertrain computer.
Smoke / EVAP Machine
Leak DetectionOur smoke machine finds vacuum leaks and EVAP system failures in minutes — saving hours of manual diagnosis and pinpointing exactly where gases are escaping.
Cylinder Leak-Down Tester
Internal EngineWe test piston rings, valves, and head gaskets before any teardown — ensuring we only repair what's actually failed, saving you money.
Honest Pricing. No Hidden Fees.
We believe in straightforward pricing. Every repair starts with a written estimate — you always know the cost before we touch your vehicle. It's the family owned, community-first approach we've practiced for over 30 years.
Diagnostic Scan
Applied toward repair if you proceed
Full OBD-II multi-system scan, trouble code analysis, and written estimate.
- All-module DTC scan
- Live data snapshot
- Written findings report
- Verbal explanation of results
- Cost credited to repair
Tune-Up Service
Parts & labor, most 4-cyl vehicles
Spark plugs, air filter, fuel filter inspection, throttle body cleaning, and performance check.
- Iridium spark plugs (OEM spec)
- Air filter replacement
- Throttle body cleaning
- PCV valve check
- Road test & re-scan
Major Engine Repair
Free estimate after diagnostic
Head gaskets, timing chains, internal components — priced per job after full diagnostic.
- Detailed written estimate
- OEM or quality-equivalent parts
- Warranty on all labor
- Nationwide 12-mo/12,000-mi warranty
- Post-repair road test & scan
Nationwide 12-Month / 12,000-Mile Warranty on All Engine Repairs
Every engine repair we perform is backed by our nationwide warranty — 12 months or 12,000 miles, whichever comes first. If a covered issue arises anywhere in the country, simply call the 800 number printed on your receipt to facilitate the claim. If the same issue returns, we fix it at no charge.
Frequently Asked Questions
Answers to the most common questions we hear about engine diagnostics and repair.
Full-Service Auto Repair
From engine diagnostics to 4WD systems — backed by 30+ years of family-owned expertise and 13 years serving St George, UT from this very location.
Family-owned and locally operated — proudly serving St George, UT and the surrounding area for over 30 years.
Schedule AppointmentDon't Ignore That Check Engine Light
Small engine problems become big, expensive ones when left unchecked. Call us today, schedule online, or stop by our shop on South Bluff Street in St George, UT. As a locally and family owned shop with over 30 years of experience — 13 years right here at this location — we're ready to help.