Mobile mechanic, San Antonio
Rough idle, hesitation, stalling at lights, or a car that cranks but won't start — often with no warning light at all. We come to you, find the actual cause with live sensor data, and fix it on the spot when we can.
Engine Diagnostics
$95
Typical time on site
45–90 minutes
Warranty
12 months / 12,000 miles
Pay over time with Affirm & Klarna
| Service | Price | What is included | Good to know |
|---|---|---|---|
| Engine Diagnostics (rough running, stalling, no-start) | $95 diagnostic fee (credited to your repair) | Live sensor data, fuel/spark/sensor testing, written findings | Credited toward repair cost if repair performed same visit |
| Check Engine Light Diagnostics | $95 diagnostic fee (credited to repair) | OBD2 bi-directional scan, fault code interpretation, repair estimate | Credited toward repair cost if repair performed same visit |
| Electrical Diagnostics | $95 diagnostic fee (credited to repair) | Circuit testing, short/open detection, wiring assessment | Fixed price. |
Prices checked October 25, 2026. Starting prices are for most vehicles; your exact price is confirmed in a written quote before any work begins. Full pricing guide: Engine diagnostics cost in San Antonio.
This is not guesswork repair. Your vehicle gets a data-driven diagnostic workflow before, during, and after every service.
Bi-directional OBD2 scanner with live data streaming — not just a code reader, but actual sensor value analysis
Freeze-frame data capture to reproduce intermittent faults that don't always trigger a code
Full written report of findings with prioritized repair recommendations — no upselling, just the facts
Plenty of drivability problems never set a code: a rough idle that comes and goes, hesitation when you merge onto Loop 1604, stalling at a light once the engine is warm, or a car that cranks fine but won't fire. Those are the jobs a code reader can't solve, because there's nothing stored to read. The cause is usually a vacuum leak, a weak fuel pump, a failing ignition coil, a dirty throttle body, or a sensor that's drifting out of range without failing outright.
That's the difference between a parts-store scan and a professional diagnostic: we test the system while it misbehaves, not just read what the computer remembered. If your check engine light is on, see our mobile check engine light diagnostics page.
Danny arrives with a bi-directional OBD2 scanner that reads all control modules — not just the engine. He pulls live sensor data: oxygen sensor switching speed, fuel trim percentages, MAF airflow values, and misfire counters. He captures freeze-frame data that shows exactly what your engine was doing when the fault triggered. For intermittent faults that don't always set a code, this freeze-frame data is often the only way to reproduce the condition without hours of test driving.
You receive a written summary of findings with prioritized repair recommendations. No upselling. No "you need to leave the car" delays. Most diagnostics wrap up in 45–90 minutes at your location.
The diagnostic fee is $95 flat. If you hire Danny to complete the repair at the same visit, the full $95 is credited toward your repair total. You only pay the standalone diagnostic fee if you choose not to proceed with the repair — which is always your decision, with no pressure.
Most shops charge $100–$150 for a diagnostic and don't credit it toward anything. Dealerships often charge $175+ just to pull codes and write up an estimate.
Crank-no-start (fuel pump, crankshaft position sensor, ignition), rough or surging idle (vacuum leaks, dirty throttle body, idle air control), hesitation under acceleration (weak fuel delivery, clogged injectors, failing coils), stalling when warm (sensor drift, EGR faults), and loss of power on the highway (restricted exhaust, transmission slipping). We also read ABS, SRS airbag, TPMS, and body control modules — most shops only read engine codes.
Pricing guide: Engine diagnostics cost in San Antonio
A simple mobile process built for busy schedules.
Share what your vehicle is doing. We pre-plan tools and parts for your Engine Diagnostics before arriving.
Home, office, apartment lot. We arrive equipped and ready to work cleanly and efficiently.
We complete the job, validate operation, and review results with you before checkout. 12-month/12,000-mile warranty included.
Traditional shop
Lowered Standards
What the customer called about, what I found, and how it ended up.
2005 Acura RSX Type-S
One afternoon I got a booking where the customer's notes described an oil leak and having to add oil every couple of miles. On a 2005 Acura RSX Type-S I knew where to look: the VVT system is very common to leak over the years. After arriving on site and running a diagnostic, I recommended replacing the VVT solenoid gasket. After the job the car had no leaks and ran like new again.
Engine Diagnostics jobs we have finished around San Antonio.
Shavano Park
Mobile valve cover gasket and half moon seal replacement on a 2001 Toyota 4Runner V6 in San Antonio. Fixed the oil smoke smell after short drives.
Straight answers from the mechanic. No sales pitch.
Still have questions?
Call or text and talk to Danny directly, no call center, no script.
More answers on the full FAQ, or send a message. Running several vehicles? See fleet service.
No. A parts-store scan only reads generic fault codes. We use a professional bi-directional scanner that can stream live sensor data, perform component tests, and pinpoint the root cause — not just report a symptom code.
Yes. A crank-no-start is usually fuel delivery, spark, or a sensor like the crankshaft position sensor. We test fuel pressure, spark, and live sensor data on-site to pin down which one, instead of guessing and swapping parts.
A car can run poorly without triggering a fault code. In that case, we use live sensor data — oxygen sensor readings, fuel trim values, and misfire counters — to identify the issue even without a stored code.
Yes. If you hire us to complete the repair on the same visit, the full $95 diagnostic fee is credited toward your total. You only pay the diagnostic fee if you choose not to proceed with the repair.
Yes. Our scanner reads all control modules — engine, transmission, ABS, SRS, TPMS, and body modules. Most shops only read engine codes. We give you the full picture.
Every repair is performed personally by Danny, with no subcontractors and no handoffs. With 10+ years of hands-on automotive experience across domestic, import, and European vehicles, Danny brings professional-grade diagnostic tools and OEM-spec parts to your driveway. He stands behind every job with a 12-month/12,000-mile warranty on all parts and labor.
Mobile repair without the dealership friction. Fast scheduling, transparent pricing, and a 12-month/12,000-mile warranty.