Your #1 most likely cause - ranked by probability for your exact vehicle
Then unlock the full report - $5.99
Causes #2 and #3 with probability scores
Step-by-step repair guide
Parts list with part numbers
Labor hours & cost estimate
Mechanic-ready summary
Relevant recalls & TSBs for your VIN
Shops charge $150+ just to read the code. This costs less and tells you more.
AmpAuto vs. the shop
AmpAuto
Shop diagnostic
Price
$5.99
$120–$200
Time to result
30 seconds
1–4 hours
Causes ranked by likelihood
✓
✗
Specific to your vehicle
✓
✓
Parts list & cost estimate
✓
Sometimes
Have to leave the house
No
Yes
Money-back guarantee
✓
No
★★★★★
"Told me it was the downstream O2 sensor, not the cat. Saved me $1,100."
- Marcus T., Toyota Camry owner
★★★★★
"Detailed steps to diagnose my P0300. Nailed the bad coil pack in 10 minutes."
- Chris R., F-150 owner
★★★★★
"Knew exactly what to tell the shop. They confirmed the same cause. No upsell."
- Jennifer L., Honda Accord owner
🚗
Diagnosing on your
Fields pre-filled - add mileage & symptoms for a more accurate result
Your Car, Your Code
🆓 First Cause Free
More detail = more accurate results. Only the DTC code is required.
⚡ Have your VIN? Auto-fill year, make, and model.
Analyzing your vehicle...
Parsing DTC codes and vehicle data
Checking NHTSA recalls and complaints
Running AI diagnostic engine
Generating repair guidance
Most Likely Cause · #1 of 3
🔍 How to Confirm This Cause
This is cause #1 of 3. Causes #2 and #3 below are also possible - and fixing the wrong one averages $340 in wasted parts. See all three before you order anything.
Cause #2 of 3
🔒 Unlock below
Cause #3 of 3
🔒 Unlock below
Full Diagnostic Report
Causes #2 and #3 account for a combined XX% probability - either one costs more to misdiagnose than this report.
All 3 causes ranked by probability
Step-by-step repair guide
Parts list & part numbers
Labor hours & cost estimate
Mechanic-ready summary
Recalls & TSBs for your VIN
$5.99one-time · instant delivery
💯
100% money-back guarantee. If the diagnosis doesn't help you fix your car, just reply to your receipt email and we'll refund you in full. No questions, no hassle.
AmpAuto AI · Specific to your exact vehicle · Instant delivery
📧 Save a free copy instead
Get this diagnosis emailed to you - no account, no spam.
Save as PDF for your records or to send to your mechanic.
💬 Common Questions
What OBD2 codes can you diagnose?
All standard P (powertrain), B (body), C (chassis), and U (network) codes from 1996 and newer vehicles. Enter one code or multiple codes separated by commas for a combined diagnosis.
Do I need a scan tool, or can I just enter a code?
If you already have a code from a previous scan or a shop printout, enter it directly - no additional equipment needed. For a more accurate diagnosis, a Bluetooth OBD2 scanner also lets you read live sensor data, which can make the difference between a $50 fix and an $800 mistake.
How accurate is AI car diagnosis?
Our reports rank causes by probability based on your specific vehicle's year, make, model, mileage, and symptoms - cross-referenced with NHTSA complaint data and known failure patterns. The goal is to tell you which cause is statistically most likely for your exact car, not just for "a car with P0420."
What is included in the $5.99 full report?
All 3 ranked causes with probability scores, a step-by-step repair guide, complete parts list with part numbers, labor hour and cost estimates, a printable mechanic-ready summary, and any relevant recalls or TSBs for your VIN.
Can I print or share the report with my mechanic?
Yes. After unlocking, you get a formatted mechanic-ready summary you can copy, print, or share directly. Most customers paste it into a text to their shop or bring a printed copy - shops consistently confirm the diagnosis.