Pre-launch · First 50 shops

Diagnose smarter.
Every fix starts here.

A diagnostic copilot for auto repair shops and mechanics. Connect with OBD, get a cited root cause, a severity read, and an ADAS recalibration flag — in seconds, not an hour.

Diagnostic Workspace2019 BMW 750Li · V12 N74B66 6.6L Twin-Turbo
● Connected
DemoMisfire· Multi-DTC cross-correlation: P0307 + P0174 + P0430
System Health Map
● OK● Warn● Fault
Engine RPMrpm
1,850
Coolant Temp°C
92
Vehicle Speedkm/h
Not captured
Throttle%
18
STFT Bank 2%
9.8
BatteryV
14.2
Diagnostic Trouble Codes
3 Warning
P0307Warning
Cylinder 7 Misfire Detected
POWERTRAIN
P0174Warning
System Too Lean (Bank 2)
POWERTRAIN
P0430Warning
Catalyst System Efficiency Below Threshold (Bank 2)
POWERTRAIN
Freeze Frame — P0307
RPM3,200
Engine Load68.2%
STFT B2+9.8%
LTFT B2+5.1%
Coolant88°C
Vehicle Speed72 km/h
P0307
Cylinder 7 Misfire Detected
Primary Diagnosis
Bank 2 Lean Condition with Cylinder 7 Misfire and Catalytic Converter Efficiency Loss
78%
Medium confidence — Verify recommended
Evidence & Reasoning
P0174 Bank 2 Lean Condition40%
STFT B2 at +9.8% and LTFT B2 at +5.1% confirm a real lean condition on Bank 2. Combined fuel-trim correction of ~14.9% is consistent with a vacuum leak, weak injector, or intake gasket issue on Bank 2. The N74 V12 twin-turbo is essentially two inline-6 engines sharing a crankshaft — bank-isolated faults are very plausible.
P0307 Cylinder 7 Misfire35%
Cylinder 7 is on Bank 2 of the N74 V12. A misfire on a bank already running lean strongly suggests the lean is the root cause and cyl-7 is the most affected cylinder. Freeze frame: 3200 RPM / 68.2% load / 72 km/h — matches the customer complaint of stumble worsening under load.
P0430 Bank 2 Catalyst Below Threshold25%
Sustained lean misfires on Bank 2 push unburned charge into the cat, causing thermal stress and efficiency degradation. P0430 is very likely a secondary symptom of the lean/misfire — the cat may recover once the root cause is fixed, but could also be permanently damaged.
Verification Steps
1
Smoke-test the Bank 2 intake tract — intake gaskets, vacuum lines, PCV system, and turbo intercooler piping (Bank 2 is the rear / firewall-side bank on the N74).
2
Inspect cyl-7 ignition coil and plug — swap coil with a known-good cylinder on Bank 2 and check whether the misfire follows the coil.
3
Test cyl-7 fuel-injector flow rate vs adjacent Bank 2 injectors; check for clogged or leaking injector.
4
Compare Bank 2 MAF readings to Bank 1 at identical conditions — a contaminated or failing MAF on B2 can cause lean compensation.
5
Inspect Bank 2 turbocharger wastegate actuator and boost-pressure lines for leaks that drive lean conditions under load.
6
After resolving the lean / misfire root cause, clear codes and drive 2–3 cycles before condemning the cat — re-evaluate P0430 only if it returns with normal trims.
7
Check Bank 2 intake VANOS for variable valve timing faults — N74 VANOS issues can contribute to bank-isolated lean conditions.
Recommended Parts
Bank 2 Intake Manifold Gasket Set
$80–$150
Available — BMW dealer or aftermarket
Cylinder 7 Ignition Coil (BMW OEM)
$45–$85
Readily available
Cylinder 7 Spark Plug (NGK / Bosch OEM spec)
$12–$25 each
Readily available
Bank 2 MAF Sensor
$150–$300
Available — confirm failure before ordering
Bank 2 Catalytic Converter (OEM)
$2,000–$4,000
Dealer order — DO NOT replace until lean / misfire root cause resolved and P0430 confirmed to persist
How it works

From scan to fix, without the research tab spiral.

01

Connect

Paste the codes, drop the freeze frame, or plug in an OBD2 adapter. No data cleanup needed.

02

Reason

Misfire cross-references real-world diagnostic records and shows its work — every citation traceable.

→ match P0301 · misfire cyl 1
→ scan 4,217 similar complaints
→ correlate freeze frame · RPM=2100
✓ root cause: coil pack, 84% cited
03

Fix

Cited root cause, severity read, and ADAS recalibration flag before your tech closes the ticket.

P0301ADAS flag
Cylinder 1 misfire detected
Replace ignition coil #1 · recalibrate lane-keep after repair
The quiet liability

A missed ADAS recalibration can cost $200K to $1M.

Cameras, radars, and lane-keep systems need recalibration after routine repairs — and most shops don't know when. Misfire flags ADAS recalibration requirements on every diagnosis, so your techs catch liability before the car leaves the bay.

98M
ADAS-equipped vehicles on US roads
85%
of required calibrations never happen
20×
lawsuits since 2018 — and climbing
Exposure · missed ADAS recal
$0
·
·
·
·
·
·
·
Recalibrations skipped this quarter
Coming soon

Wiring diagrams,
built into the diagnosis.

Pinpoint the exact wire, connector, and pin for the circuit Claude flagged — no flipping between SIS tabs and the diagnosis. Click a DTC, see the schematic; trace ground paths and supply rails inline.

Original OEM diagrams. Licensed factory schematics — never AI-generated.
Schematic preview · in development
Pricing

One price. One hour saved per vehicle.

$149/mo · per shop
Save one hour of research per vehicle. One fix pays for a month of Misfire.
Join the waitlist →
Tekmetric · $199+/mo
ALLDATA · $189–209/mo
Questions

Straight answers.

Pilot program rolling out now to the first 50 shops. General availability mid-2026. Early access gets you preferred onboarding and grandfathered pricing.
None, if you're pasting codes from your existing scan tool. If you want live vehicle connection, any OBD2 Bluetooth or wifi adapter works — no proprietary hardware, no rental, no contracts.
Those are shop-management and repair-info platforms. Misfire is a diagnostic copilot — it reads your scan data, cross-references real-world fixes, and gives you a cited root cause in seconds. It complements your existing stack; it doesn't replace it.
Your diagnoses stay yours. VINs and customer details aren't shared across shops. We store session data encrypted at rest; you can export or delete your history anytime.

Get in the first 50 shops.

Early access includes grandfathered pricing, direct onboarding, and a line to our team for the edge cases that matter to your bay.

No spam. Unsubscribe anytime.
Pre-launch · First 50 shops

Diagnose smarter.
Every fix starts here.

A diagnostic copilot for auto repair shops and mechanics. Plug into OBD-II, get a cited root cause and ADAS recalibration flag — in seconds.

I41234P03021342FIRING C01INLINE-4 · 720° CYCLEORDER: 1-3-4-2
Native app · Preview

MechX, in your pocket.

Swipe through the upcoming native app — same diagnostic engine, native BLE, designed for the bay.

9:41● ● ●
MechX
DTCs detected
2018 Honda Civic 1.5L Turbo
VIN · 2HGFC2F59JH5••••••
P0302
Cylinder 2 Misfire Detected
P0171
System Too Lean (Bank 1)
P0420
Catalyst Efficiency Below Threshold (Bank 1)
MechX
Connect adapter
Pairing via Bluetooth LE
OBDLink CX
00:1E:C0:1A:42:9F
CONNECTED
Veepeak BLE+
00:11:22:33:44:55
Vgate iCar Pro BLE 4.0
AA:BB:CC:DD:EE:FF
Reading vehicle data…
live PIDs · freeze frame · VIN
MechX
Freeze frame
P0302 · captured at fault
Engine RPM
2840rpm
Engine Load
64.7%
Vehicle Speed
68km/h
Coolant
91°C
IAT
38°C
MAF
12.4g/s
STFT B1
+14.1%
LTFT B1
+18.4%
STFT + LTFT both elevated → Bank 1 lean. Worst on cyl-2 → P0302.
MechX
Root cause
78% · Medium confidence — Verify recommended
Root cause
Bank 1 Lean Condition with Cylinder 2 Misfire and Catalyst Efficiency Loss
P0171 Bank 1 Lean Condition
Long-term fuel trim sitting at +18.4% indicates the ECU is adding ~18% more fuel than the MAF predicts. A vacu…
P0302 Cylinder 2 Misfire
On a 4-cyl engine running lean, the cylinder with the weakest spark or worst air-fuel mixing fails first. Free…
P0420 Cat Bank 1 Below Threshold
Sustained lean misfires push unburned fuel into the catalyst, causing thermal stress and efficiency degradatio…
← swipe →
Native app preview — desktop UX is richer and fully working today.
How it works

From scan to fix, without the research-tab spiral.

OBD
01

Connect

Plug a BLE OBD-II adapter into your scan tool. The native MechX app pairs over Bluetooth and reads live PIDs + freeze-frame in seconds.

AI
02

Reason

MechX cross-references DTCs, freeze-frame, and trim data against real diagnostic records — and shows its work, citation by citation.

✓
03

Fix

Cited root cause, severity read, parts list, and an ADAS recalibration flag — before the tech closes the ticket.

From the port to the phone, in seconds.

OBD-II PORT
Vehicle data bus
BLE ADAPTER
OBDLink CX · Veepeak BLE+
MECHX APP
Native iOS / Android

Works with any BLE OBD-II adapter. BT-Classic adapters supported on the Android app and on iOS only when MFi-certified (e.g. OBDLink MX+).

Wiring · coming soon

Wiring diagrams,
built into the diagnosis.

Pinpoint the exact wire, connector, and pin for the circuit MechX flagged. Trace ground paths and supply rails inline.

Schematic preview · in development
OEM diagrams. Licensed factory schematics — never AI-generated.
ADAS · Liability shield

The recalibration flag your insurance carrier wishes you had on file.

FCW

Forward collision warning

After a windshield replacement or front-end collision, the camera angle drifts. ADAS-flagged repairs miss it 40% of the time.

LKA

Lane-keep assist

A subtle steering pull post-alignment usually traces back to a yaw-rate sensor that needs recalibration, not the alignment itself.

AEB

Automatic emergency braking

Radar mounted off the bumper cross-member shifts every time a tow hook eats a parking block. Liability is on the shop that closed the ticket.

Pricing

One price. One hour saved per vehicle.

$149/mo · per shop

Save one hour of research per vehicle. One fix pays for a month of Misfire.

Join the waitlist →
Tekmetric · $199+/mo
ALLDATA · $189–209/mo

Get in the first 50 shops.

Early access includes grandfathered pricing, direct onboarding, and a line to our team for the edge cases that matter to your bay.

No spam. Unsubscribe anytime.