Littleton, CO
Check engine light on? Something feels off? AutoTrek's advanced OBD-II diagnostic system reads every fault code and live data stream across your entire vehicle — pinpointing the exact cause fast, so repairs are targeted and accurate.
What's Included
A code reader from the parts store tells you a number. AutoTrek tells you what's actually wrong — and what it will take to fix it correctly.
Full retrieval of all stored, pending, and permanent Diagnostic Trouble Codes across engine, transmission, ABS, airbag, and body control modules.
We monitor real-time sensor data — oxygen sensors, MAF, coolant temperature, fuel trims, and more — to identify intermittent faults that don't always trigger a code.
Targeted testing of sensors, actuators, solenoids, and modules to confirm which specific component has failed — not just which system is affected.
You receive a full written report detailing every code found, what it means, the likely root cause, and our recommended repair with a cost estimate.
Fault codes point to a system, not always the exact part. Our ASE Certified techs apply experience and additional testing to confirm the true root cause before recommending repairs.
We verify that all emissions monitors are complete and ready for Colorado's emissions testing program before you make a wasted trip to the station.
Why It Matters
A check engine light alone doesn't tell you if you need a $15 gas cap or a $1,500 catalytic converter. Without proper diagnostics, shops guess — and guessing leads to replacing parts that don't fix the problem. AutoTrek uses professional-grade scan tools and live data analysis to get the right answer the first time.
Our diagnostic fee is credited toward any repair work you choose to have done at AutoTrek. You're not paying just for a code — you're paying for an expert diagnosis that leads to a targeted, cost-effective fix.
Schedule DiagnosticWarning Signs
Check engine light is on — solid or flashing, a fault code is stored and needs to be read and interpreted.
Rough idle, misfiring, or engine hesitation — could be a sensor, ignition, fuel delivery, or mechanical issue.
Sudden drop in fuel economy — a failed sensor or fuel system component often causes a measurable MPG loss.
Failed emissions test — we diagnose the failing monitor or code and repair what's needed to pass.
Stalling, hard starting, or no-start condition — diagnostic quickly isolates the faulty system causing the problem.
Common Fault Codes
These are among the most frequent OBD-II codes AutoTrek diagnoses and repairs for Littleton, CO drivers.
Catalytic converter degraded or failing. Can also be caused by an O2 sensor or exhaust leak upstream.
Engine misfiring on multiple cylinders. Often spark plugs, coils, injectors, or a vacuum leak.
Fuel mixture too lean. Common causes: MAF sensor, vacuum leak, fuel pressure issue, or O2 sensor.
Small EVAP system leak. Often just a loose or faulty gas cap — or a cracked EVAP hose or purge valve.
Engine not reaching operating temperature. Typically a faulty thermostat that's stuck open.
Idle speed too high. Often a dirty throttle body, vacuum leak, or faulty idle air control valve.
Our Process
We connect to your vehicle's OBD-II port and retrieve all fault codes across every module — engine, transmission, ABS, TPMS, and body systems.
We analyze real-time sensor data and perform component-level tests to verify the fault and rule out secondary causes before recommending a repair.
You receive a complete report explaining what was found, what it means, and what needs to be done — with a flat-rate repair estimate.
Once approved, we complete the repair and perform a post-repair scan to confirm all fault codes are cleared and monitors are functioning correctly.
Engine diagnostic service typically ranges from $99–$150. If you choose to complete the repair at AutoTrek, this fee is credited toward the total cost. No work is performed without your written approval, and we never recommend repairs your vehicle doesn't need. Call (303) 328-3356 with any questions.
FAQ
Book an Appointment
Stop guessing. Same-day diagnostic appointments available. Call us or submit the form and we'll confirm shortly.
8161 S Grant Way, Littleton, CO 80122
Mon–Fri: 9:00am – 5:00pm