Mobile service · Open 24/7

Mobile check engine light diagnostics in Spokane

A glowing check engine light can mean anything from a loose gas cap to a misfire that is damaging your catalytic converter. Pulling a code is only the start. We read the codes, look at live sensor data, and test the actual part before we tell you what is wrong, so you do not pay for parts you did not need. We have full diagnostic capabilities, including complete system scans of engine, transmission, ABS, airbag, and body modules.

Professional XTOOL diagnostic scan tool used by Farrell's Automotive for full system scans
Full diagnostic capabilities and complete system scans, right in your driveway.

What a mobile diagnostic includes

  • Reading stored and pending trouble codes with a professional scan tool
  • Checking live data such as fuel trims, misfire counters, and sensor readings
  • Visual inspection of wiring, vacuum lines, and connectors related to the code
  • A plain-English explanation of the cause and what it will take to fix

Common causes we track down

  • Misfires from worn spark plugs, coils, or injectors
  • Oxygen sensor and catalytic converter efficiency codes
  • EVAP leaks, including the classic loose gas cap
  • Vacuum and boost leaks, mass airflow and MAP sensor faults

A flashing check engine light usually means an active misfire. Avoid driving and call us; we can come to you instead.

Pricing

Labor is $125/hr, and common jobs are quoted as a flat-rate price from book time. You get a written estimate before any work begins. See our pricing for trip, diagnostic, and after-hours rates.

Where we offer diagnostics & check engine light

We come to you anywhere in our service area, including Spokane, Spokane Valley, Liberty Lake, Cheney, Mead, Airway Heights, Coeur d'Alene, Post Falls, Hayden Lake, Sandpoint, Priest River, Newport, Deer Park, Elk, Chewelah, Spirit Lake.

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Aaron and Kaila, owners of Farrell's Automotive

Locally owned · Open 24/7

Run by Aaron & Kaila

Husband-and-wife mechanics. Aaron's specialty is troubleshooting and diagnostics, with lots of experience on German and Japanese imports like Audi, Volkswagen, BMW, Subaru, Toyota, Honda, and Acura. Kaila's specialty is customer service and wrenching skills. When you call, you talk to the people who do the work.

Meet Aaron, Kaila, Dora & Bagel →

Need a mechanic today?

Tell us the vehicle, the problem, and where you are. We will confirm a time that works, day or night.

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