March 21, 2026

We Threw the Switch. ARIA Sees Everything Now.

220 parameters. Full SAE spec. The biggest expansion ever.

We just shipped the biggest OBD-II decoder expansion OBDAI has ever seen. ARIA now decodes the complete SAE J1979DA parameter set—all 220 items, current through the April 2024 publication.

April 2024 is the cutting edge for J1979-1 coverage, capturing the latest PID expansion before the industry’s shift to UDS-driven J1979-2 for next-gen vehicles.

If your vehicle speaks J1979-1, ARIA now understands every word.

The Part That Changes Everything

Version 1 of ARIA’s decoder was built around a deliberate foundation: get the core ICE analog parameters right first. RPM, fuel trims, temps, pressures, O2 voltages — the parameters that power 90% of real-world diagnostics on the vehicles most people actually drive. That was the right call. A solid foundation before you build higher.

Version 2.10 is what you build higher.

Most scan tools show you a snapshot. RPM right now. Coolant temp right now. ARIA records everything second-by-second so her AI can reason across time. The v1 decoder handled that well for analog values. The next evolution was expanding that same second-by-second capture to the full parameter spectrum — including the two data types that v1 deliberately deferred:

ARIA now captures all three types of OBD data over time:

Analog values — the numbers everyone knows. RPM, temps, pressures, voltages.
Enumerated states — named modes, not numbers. Fuel system status: was it Open Loop or Closed Loop at second 14? Did it switch? When?
Status bits — the flags your ECU sets inside a single PID. Is the EGR system active? Did a readiness monitor clear mid-drive? Which oxygen sensors are present and reporting? ARIA now sees every bit, every second.

In v1, PIDs that returned anything other than a single number — a bitmask, a state enum, multiple packed values — were decoded for display but not captured in the time-series record. That was a conscious Phase 1 boundary: ship a rock-solid analog foundation, then expand. Things like open-loop/closed-loop transitions, monitor readiness changes, and fuel system mode switches were available in the moment but not tracked over time.

Now they are.

That means ARIA can now detect:

Open-loop to closed-loop transitions — exactly when and at what conditions
A readiness bit that cleared for 3 seconds and reset — the kind of transient fault that never throws a code
Bank-to-bank fuel trim divergence
NOx conversion efficiency degradation over a drive cycle
Battery pack temperature imbalances during charging

The difference between “I think it might be the O2 sensor” and “Bank 2 Sensor 1 went lean for 4 seconds at 2:34 into your drive while fuel trims were compensating +12% — here’s what that means.”

The EV Parameters Nobody Else Has

Here’s what ARIA can now read from electric and hybrid vehicles:

High-Voltage Battery Pack Diagnostics (up to 4 packs):

State of Charge – not the guess on your dash, the actual pack SOC
State of Health – battery degradation, the metric that determines your range loss over time
Charge rate in kW – real-time power flow during charging
Pack temperature (min/max/average) – thermal management monitoring
Capacity in Ah – actual vs rated capacity
Energy throughput – lifetime kWh in and out of the pack

Dual Motor Support:

Individual motor RPM
Individual motor torque
Because your AWD EV has two motors and ARIA can see both

Fuel Cell Vehicles:

Stack voltage, current, and power output
Yes, if you’re one of the 12 people with a Mirai, ARIA’s got you

Certified Range Data:

Rated kWh capacity
Remaining range in km
The numbers your vehicle reports to regulators, not the optimistic guess on the cluster

The Diesel & Commercial Parameters the Cheap Tools Can’t Touch

Fleet operators and diesel techs – this one’s for you:

NOx Monitoring (all 4 sensor positions):

Raw concentration (ppm)
Corrected concentration
Engine-out vs tailpipe mass emission rate
This is how you prove your SCR system is actually working

Full Aftertreatment Coverage:

DPF pressure and temperature (dual bank support for twin-DPF systems)
SCR catalyst NH3 storage
DEF dosing (dual injector support)
Hydrocarbon doser flow rate and duty cycle
Particulate matter inducement system status

AECD Timers (Groups 21-25):

Extended emission control device runtime tracking
The data EPA auditors actually look at

Exhaust Gas Temperature – Extended Banks:

Sensors 9-12 on Banks 1 and 2
Because your Class 8 diesel has more EGT sensors than a Honda Civic has cylinders

Why This Matters

Every $30 Amazon scan tool is running a decoder table from 2018. Maybe 2020 if you’re lucky.

The SAE didn’t stop adding parameters in 2018. They added EV battery diagnostics. They added fuel cell parameters. They added extended emissions monitoring for HD-OBD and Euro VI compliance.

Your scan tool didn’t get the memo. ARIA did.

And here’s the thing – this is the complete J1979-1 parameter set. We implemented everything in the digital annex. When future vehicles shift to J1979-2 (UDS), we’ll be ready for that too.

When we ship J1979-2 support, ARIA will speak both languages.

Old cars. New cars. Gas. Diesel. Hybrid. Electric. Fuel cell.

ARIA doesn’t care what powers your vehicle. She reads it all.

What’s Next

UDS (J1979-2).

The 2027+ vehicles are moving to Unified Diagnostic Services. Different protocol. Deeper data. Manufacturer-specific extensions.

Most scan tools on the market today won’t be able to talk to these vehicles at all.

ARIA will.

But that’s the next update. Today, we’re shipping full J1979-1 coverage – every parameter in the SAE digital annex, decoded and analyzed in real-time.

Your $8,000 dealer scan tool just got competition.

Get the Update

Version 2.10 is rolling out now on Windows, Android, and iOS.

If you’re already a Premium subscriber, you’ll get the update automatically.

If you’re not – what are you waiting for?

ARIA. She doesn’t guess. She knows.

Daniel-Blackmon Founder

See Full Bio