P0300 · Diagnostics
Check engine? Check here.
A code tells you where to look, not what's broken. A P0171 can be a $20 vacuum hose or a $400 fuel pump. We pull the codes, read live data, and run pinpoint tests until we can show you the actual cause. Then you decide.
- Pricing
- $125
- Typical time
- Same day in most cases
- Warranty
- 24 mo / 24,000 mi
Symptoms
Sound familiar?
- Check engine light on or flashing
- Rough idle, stalling or hesitation
- Worse fuel mileage than usual
- Hard starting, especially cold mornings
- Strange smells: fuel, burning oil, sweet coolant
- Warning lights for ABS, traction or airbag
Not sure it's this? Text a photo or a short video to 603-818-3121 and we'll point you in the right direction.
How we handle it
Our diagnostics process
- 01
Scan
Pull stored and pending codes from every module, not just the engine.
- 02
Live data
Watch sensors in real time: fuel trims, misfire counters, O2 switching.
- 03
Pinpoint test
Smoke test, voltage drop and component tests to prove the cause.
- 04
Report
Text you the findings with photos and a clear price. You approve before any repair.
Pricing
What affects the price
- A flat $125 covers most problems
- Unusually involved or intermittent problems can take more testing. We’ll tell you before going further
- Some tests need parts removed for access
- The diagnostic fee is credited toward the repair if you have us do the work
You'll get a more detailed, itemized quote for your car, and we'll go over it with you before any repairs. Nothing gets done without your approval.
- How our labor rate compares with the dealer
- Coupons: up to $100 off bigger jobs
- 24-month / 24,000-mile warranty
Warranty
24 months / 24,000 miles
Parts and labor on qualifying repairs. If something we fixed fails, we make it right.
Read the warranty →Questions
Diagnostics FAQ
Q01Can I keep driving with the check engine light on?
If it's steady, usually yes for a short while. Book a scan soon. If it's flashing, that's an active misfire that can damage the catalytic converter. Slow down and call us.
Q02The parts store read my code for free. Why pay for diagnostics?
A free code read gives you a starting point. A diagnosis is the testing that proves which part failed, so you don't buy parts you didn't need.
Free help
Before you call.
Guides and notes from the shop on diagnostics problems. Some you can handle yourself.
Dashboard warning lights, decoded
Tap the light on your dash to see what it means, how serious it is, and whether you can keep driving.
HELP-07 · RoadsideAfter a fender bender: a calm, step-by-step checklist
What to do at the scene, what to photograph, and the hidden damage worth checking afterward.
NOTE-03 · Garage noteWhat your check engine light is actually telling you
Steady vs. flashing, what a code really means, and when it’s safe to keep driving.
More services
While it's here.
Brakes
Pads, rotors, calipers and lines. Measured and photographed, then texted to you before any repairs.
Quoted up frontSVC-30K02Oil & Maintenance
Oil changes, filters, fluids and 30/60/90k services done to your manufacturer’s schedule, not ours.
Quoted up frontTIR-3203Tires & Alignment
Mounting, balancing, rotations, TPMS and alignment checks, plus honest tread readings in 32nds.
Quoted up frontNeed diagnostics?
Call, text or book online. Send us a photo or a video of the noise and we’ll tell you what we think before you even come in.