An obd2 scanner with throttle relearn runs the throttle body relearn function that resets the idle airflow your engine computer learned. Four picks below list it, but that list comes from a third-party roundup, not a manufacturer.
Not every OBD2 tool has this function, and some relearn tools only cover tire sensors. Start with your make, model and year, then confirm the scanner lists a throttle body relearn for that exact car.
| Pick | Best for | Key fact |
|---|---|---|
| Autel MaxiPRO MP900-BT | Owners who want several relearn jobs in one tool | Lists throttle body, crankshaft, TPMS, transmission, steering angle and key FOB |
| Launch X431 V Pro 5.0 Elite | Owners with mixed brands | Listing claims coverage of more than 200 car brands |
| Autel MaxiPRO MP808S | Owners of US, EU and Asian cars from 1996 or newer | Lists throttle body and TPMS, with no crankshaft relearn |
| Ancel V6 Plus+ | Owners who need throttle body and TPMS only | Lists throttle body, TPMS and transmission, with no crankshaft relearn |
What a Throttle Relearn Does
A throttle relearn resets the idle airflow the engine computer learned for the throttle body. Saab’s 2011 9-5 procedure expects the airflow compensation value to read 0 percent afterward.
The relearn matters when the computer’s stored idle values no longer match the throttle body. In that case the engine can idle off target, and an obd2 scanner with throttle relearn can send the reset command directly instead of relying on a timed routine alone. If the throttle body itself is worn or failing, throttle body replacement cost shows what the repair typically runs.
Scan tool menus label this function in different ways, so search the menu for words like throttle, idle or learn. Not every scanner has the function, so an obd2 scanner with throttle relearn must list it by name. Some relearn tools only cover tire sensors, which is a different job. If the dashboard already shows a limp mode warning, read about what causes reduced engine power before you start.
Scanners That List Throttle Body Relearn
Four scanners in one OBDPlanet relearn roundup list a throttle body relearn, and their other relearn functions differ. Compare the function list before you buy any obd2 scanner with throttle relearn on this page.
| Tool | Throttle body | TPMS | Crankshaft | Transmission | Other listed functions |
|---|---|---|---|---|---|
| Autel MaxiPRO MP900-BT | Yes | Yes | Yes | Yes | Steering angle, key FOB |
| Launch X431 V Pro 5.0 Elite | Yes | Yes | Yes | Yes | Brake position |
| Autel MaxiPRO MP808S | Yes | Yes | No | Yes | None listed |
| Ancel V6 Plus+ | Yes | Yes | No | Yes | None listed |
Each row in this table is a claim about an obd2 scanner with throttle relearn, taken from the roundup’s product text rather than a bench test. The roundup gives a brand count for two tools and no compatibility statement for the Ancel, so confirm the vehicle list on each product page.
Best OBD2 Scanner with Throttle Relearn Picks Compared
Among the obd2 scanner with throttle relearn picks, the Autel MaxiPRO MP900-BT lists the most relearn functions, while the MP808S and Ancel V6 Plus+ do not list crankshaft relearn.
Autel MaxiPRO MP900-BT
This tool lists TPMS, throttle body, crankshaft, transmission, steering angle and key FOB relearns. It suits an owner who wants a single obd2 scanner with throttle relearn for several relearn jobs, but the roundup gives only a general compatibility line, so check your make and year before you buy.
Prime Autel MaxiPRO MP900-BT KIT Scanner
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Launch X431 V Pro 5.0 Elite
The roundup lists crankshaft, TPMS, throttle body, transmission and brake position relearns, and says the tool covers more than 200 car brands. For an obd2 scanner with throttle relearn, that brand count is the widest claim in this group, but it comes from the listing, not from a make-by-make chart.
Autel MaxiPRO MP808S
This tool lists throttle body, TPMS and transmission relearns, but not crankshaft relearn. The roundup says it covers 150 brands and US, EU and Asian models from 1996 or newer, which suits owners of those cars who do not need crankshaft work.
Ancel V6 Plus+
This tool lists throttle body, TPMS and transmission relearns, with no crankshaft relearn. The roundup gives no compatibility statement, so ask the seller for the make and year list before you buy.
The roundup does not state prices, so check the current price at the retailer before you choose any obd2 scanner with throttle relearn from this list.
How to Run a Throttle Relearn with a Scan Tool
A scan tool relearn can require no stored trouble codes, the ignition on with the engine off, and a vehicle speed of zero, as in Saab’s 2011 9-5 procedure. The Saab page lists these preconditions in its Saab service information for a 2.0-liter petrol engine.
- Read the stored trouble codes and make sure none of the listed codes is set.
- Turn the ignition on with the engine off, and confirm the vehicle speed reads zero.
- Open the throttle or idle learn function in your obd2 scanner with throttle relearn menu and follow the prompts.
- Start the engine and watch the throttle airflow compensation value, which should read 0 percent with a normal idle.
- Clear the trouble codes with the scanner.
Preconditions and on-screen wording differ by make and model, so treat these steps as a checklist and confirm them against your own car’s service information. For the clearing step, see resetting a check engine light the right way.
Relearn Without a Scan Tool on One Saab Example
A 2011 Saab 9-5 with a 2.0-liter petrol engine can learn idle without a scanner, using three-minute idle runs and a 60-second ignition-off wait. The page sets these limits for the manual learn:
- Engine speed between 450 and 4,000 RPM
- Engine vacuum above 5 kPa and mass airflow above 2 g/s
- Ignition 1 voltage above 10 volts
- Idle in park or neutral for 3 minutes, then turn the ignition off for 60 seconds
- Drive more than 10 km (6 mi), then accelerate to wide open throttle and release
- If idle is still not learned, drive above 70 km/h (44 mph) with several decelerations
This procedure belongs to that one model and engine. Do not apply these numbers to other cars. If the check engine light comes on during the drive cycle, the page says to clear idle-related codes so the computer can keep learning.
Tools That Do Not Fit This Job
The Launch CRT5011E and the GM VXDAS relearn kit are TPMS tools, so their listing text says they do not run a throttle body relearn.
- Launch CRT5011E: a 2-in-1 OBD2 and TPMS tool. The listing says it lacks throttle body and crankshaft relearn, so it fits tire sensor work only.
- VXDAS TPMS relearn tool for GM vehicles: the listing says it is not an OBD2 scan tool and has no diagnostic functions.
- Basic code readers: a tool that only reads codes has no learn command, so it cannot perform the relearn. See OBD2 code readers for basic code reading if that is all you need.
If a product listing does not name throttle body relearn, assume the obd2 scanner with throttle relearn you are looking at lacks it until the seller confirms in writing.
How to Choose the Right OBD2 Scanner with Throttle Relearn for Your Car
Pick an obd2 scanner with throttle relearn only after its listed functions include throttle body relearn for your exact make, model and year.
- Vehicle list: check the make, model and year on the product page, not only the brand count.
- Function name: confirm the tool lists throttle body relearn by that name or a clearly similar one.
- Other relearns: pay for TPMS or transmission relearn only if you need those jobs too.
- Price: compare the current retailer price, since none was confirmed for this article.
An obd2 scanner with throttle relearn that lists your car still may not cover every trim or engine, so the car’s own service information remains the final check. Some relearn commands are bidirectional functions, so compare bidirectional scanners for component tests as well.
Frequently Asked Questions
Does every OBD2 scanner support throttle relearn?
No. Only some scanners list a throttle body relearn function, and it is not on every model. Check the make, model and year on the product page before you buy an obd2 scanner with throttle relearn, because a brand name alone does not confirm the function for your car.
Can I do a throttle relearn without a scanner?
Sometimes. Saab’s 2011 9-5 with a 2.0-liter petrol engine has a manual idle learn that uses timed idle runs and ignition-off waits. That procedure is specific to that model, so check your own car’s service information before you try a manual method.
Is a TPMS relearn the same as a throttle relearn?
No. A TPMS relearn programs the tire pressure sensors, while a throttle relearn resets the idle airflow the engine computer has learned. Several scanners list both as separate functions, and TPMS-only tools cannot run the throttle job.
What should I see after a successful relearn?
On Saab’s 2011 9-5 procedure, the throttle airflow compensation value should read 0 percent and the engine should idle normally. After that, clear the stored trouble codes with the scanner. Use this as a reference for your own car, and check its service information if your readings differ.
Are the scanner prices in this article current?
No prices were confirmed for this article, so none appear here. Retailer prices change often, so check the current price on the seller’s product page before you buy. Compare the function list first, since a cheaper tool without throttle body relearn will not do the job.
Start with the vehicle list, then the function list, then the price. An obd2 scanner with throttle relearn that does not list throttle body relearn for your car will not do this job, so the check takes a few minutes and can save a return.
