Reach under the dashboard of your car, just below and to the left of the steering column. There's a small trapezoid-shaped socket there — 16 pins, usually with a plastic cover or sometimes just open. It's been in every car sold in India since 2010. Most owners have never noticed it. Almost none know what it does.
That port is called the OBD2 port. OBD stands for On-Board Diagnostics. The “2” is because there was an OBD1 — a much simpler, manufacturer-specific version from the 1980s that wasn't standardised across brands. OBD2 is the universal standard that every car manufacturer agreed to follow, which means the same 16-pin connector, the same communication protocols, and a common set of data that any compatible device can read.
Your mechanic uses it when you bring the car in with the check engine light on. He plugs in a scan tool, reads the fault code, and tells you what's wrong. What most people don't realise is that the same port is accessible all the time — not just at the service centre — and it exposes far more than fault codes.
What data actually comes out of it
The OBD2 standard defines a set of parameters called PIDs — Parameter IDs. Some are universal across all cars. Others are manufacturer-specific and vary by brand and model. The universal ones include:
- Engine RPM — how hard the engine is working at any moment
- Vehicle speed — as reported by the ECU, independent of GPS
- Throttle position — how far down the accelerator is pressed, in percentage
- Coolant temperature — engine running hot is an early warning sign most drivers ignore until it's too late
- Battery voltage — a slow battery drain shows up here days before the car won't start
- Fuel system status and short-term fuel trim — how efficiently the engine is burning fuel relative to what it should be burning
- Mass airflow rate — used to calculate real-time fuel consumption in litres per 100 km
- Diagnostic Trouble Codes (DTCs) — the fault codes that trigger the check engine light, readable in plain language
- Oxygen sensor readings — indicate whether the fuel mixture is running rich or lean
On BS6 vehicles — every new car sold in India since April 2020 — the data is more comprehensive. BS6 vehicles report more granular emission data, more detailed fuel system parameters, and in many cases manufacturer-specific data that covers things like tyre pressure monitoring and ADAS system status.
Does your car have an OBD2 port? If it was manufactured after 2010 and sold in India, almost certainly yes. This covers all BS4 and BS6 vehicles. If you have an older car — pre-2010 — check your owner's manual. Some manufacturers added OBD2 ports voluntarily before the Indian mandate came in.
What an OBD2 tracker does with all of this
A standalone OBD2 reader — the kind your mechanic uses — is passive. You plug it in, read the codes, unplug it, and go. An OBD2 tracker is different. It stays plugged in permanently, adds a GPS module and a cellular SIM card to the OBD2 data stream, and sends everything to a cloud platform in real time.
The result is a continuously updated picture of your vehicle that combines location (where the car is) with vehicle state (what the car is doing). These two data streams together are worth considerably more than either one alone.
In practice, this means:
Live location and trip history
Every trip is logged automatically — start time, end time, route, distance, and top speed. No manual input. If you share a car with a family member or a driver, you have a complete record of where it went and when, without having to ask.
Fuel efficiency per trip
By combining throttle position, mass airflow, and GPS speed data, the tracker calculates actual fuel consumption per trip — not the averaged figure your dashboard displays, but the real number for that specific journey. Most people are surprised to find that the same route can vary by 20–30% in fuel consumption depending on how it's driven.
Engine health alerts
If a Diagnostic Trouble Code appears — anything from a loose fuel cap (the most common cause of check engine lights) to a failing oxygen sensor — you get a notification on your phone with the code in plain language, not hex. You can look it up before calling the service centre, which saves you from being told something needs replacing when it doesn't.
Driving behaviour
Harsh braking, sharp acceleration, high-speed cornering — these all show up in the OBD2 and accelerometer data. Parents tracking a car their teenager is driving will find this more useful than location alone. Fleet managers use the same data to score and coach drivers, which is where the numbers get interesting — a 40% improvement in driver scores translates directly into fewer accidents and lower fuel costs.
Ignition on/off alerts
The moment the engine starts, the OBD2 port gets power. The moment it stops, power cuts. A tracker that monitors this transition sends you a notification every time the car starts — which is also the moment a theft begins. We wrote about what happens when a car is stolen in India and how that instant alert changes the recovery outcome.
Where to find the port in common Indian cars
The OBD2 standard specifies that the port must be within 60 cm of the steering wheel and accessible without tools. In practice, the location varies a little by brand:
- Maruti Suzuki (Swift, Dzire, Baleno, Brezza): Under the dashboard to the left of the steering column, often with a small flip-down cover.
- Hyundai / Kia (i20, Creta, Seltos, Venue): Below the steering column, usually visible without bending far. Some models have it slightly right of centre.
- Tata (Nexon, Punch, Harrier): Left of the steering column, lower panel. The Nexon EV has the port in the same location but reports extended EV-specific parameters.
- Honda (City, Amaze, WR-V): Slightly right of the steering column on most models — less intuitive than others.
- Mahindra (XUV700, Scorpio, Thar): Left of the steering column, sometimes behind a removable panel on older models.
If you can't find it by feel, turn on a torch and look directly below the steering wheel. You're looking for a 16-pin trapezoid socket roughly the size of two stacked USB-A ports.
What OBD2 trackers cannot do
There are two limitations worth being honest about, because some vendors gloss over them.
They're visible
An OBD2 tracker sits in an accessible port under the dash. Anyone who opens your car door and knows what to look for can unplug it in two seconds. This makes OBD2 trackers well-suited for everyday monitoring — trips, fuel, health alerts, driver behaviour — but less reliable as a theft-recovery device against a determined thief. For that layer of protection specifically, a hard-wired hidden tracker is the right addition.
They lose power when the battery is disconnected
The OBD2 port draws power from the car's main battery. If the battery is disconnected — which some thieves do to disable alarms — an OBD2 tracker without a built-in backup battery goes dark. Look for a tracker with at least 4–6 hours of internal battery backup if continuous tracking through a battery disconnect matters to you.
The short version: OBD2 trackers are excellent for knowing what your car is doing and where it is, day to day. They give you data your car has always been generating but never showing you. For theft recovery specifically — where a determined thief might remove or disable the device — pair them with a secondary hard-wired unit hidden in the vehicle.
CNG and electric vehicles
CNG vehicles have OBD2 ports and most parameters work normally. The fuel-specific data (fuel trim, oxygen sensors) reports on the petrol system — meaningful when running on petrol, less so on CNG. Some aftermarket CNG kits add their own ECU that doesn't communicate over the standard OBD2 protocol, so fuel consumption data can be inaccurate on CNG mode specifically. Location, ignition, and driving behaviour data are unaffected.
Electric vehicles — the Tata Nexon EV, MG ZS EV, Ola S1 Pro and others — have OBD2 ports, but the data they expose varies significantly by manufacturer. Battery state of charge, range estimation, and motor temperature are available on some EVs via manufacturer-specific PIDs; others don't expose them at all over standard OBD2. Location, trip history, and driving behaviour work on all of them.
Is it safe to leave a device plugged in permanently?
Yes, with one caveat. The OBD2 port on most cars remains powered even when the ignition is off — drawing a small parasitic current from the battery. A well-designed OBD2 tracker enters a low-power sleep mode when it detects the ignition is off, drawing microamps rather than milliamps. This is negligible on a healthy battery.
On a car that sits unused for more than two to three weeks at a stretch, any parasitic drain can matter. If that describes your situation, either unplug the tracker while the car is parked long-term, or look for a device that explicitly advertises ultra-low standby current (under 5 mA).
ViaLoop's device handles both: sleep mode kicks in within 90 seconds of the ignition turning off, and the tracker wakes instantly the moment the port sees ignition power again. The install takes under three minutes — plug in, pair with the app, done.