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Toyota Avalon
IMMO-OFF Calculator

Upload your Toyota/Denso RA86 (93C86) immobilizer EEPROM read from a 2006 Avalon 3.5L (ECU 89661-07450). We check it against the exact known layout and flip the immobilizer status word — a ready-to-write dump back in seconds, no checksum step.

Upload · verify · pay · download One 2048-byte EEPROM, no checksum needed Not charged if we can't do it

Online IMMO-OFF

Upload your EEPROM dump

$150
Byte-verified first · you're not charged if we can't match it

Instant file back

A matching 89661-07450 EEPROM dump is processed and returned in seconds.

Byte-verified first

We check your exact file against the known layout before you pay anything.

Skipped if we can't

Not this ECU? Nothing is written and we route you to mail-in.

One targeted word

Only the immobilizer status word changes — VIN and everything else in the EEPROM stays untouched.

Three steps, no shipping

If you can read and write the immobilizer EEPROM, you can have an immo-off dump in under a minute.

01

Read the EEPROM

Pull a full 2048-byte read of the RA86/93C86 immobilizer EEPROM with a chip programmer or bench clip.

02

Upload & verify

Drop the dump above. We check it against the known ECU 89661-07450 layout — pay only if it matches.

03

Download in seconds

The immo-off dump is returned instantly. Write it back to the chip with your own programmer.

Read it with any supported tool

Pull the EEPROM with a chip programmer or bench clip, then upload it above.

Xhorse Multi-Prog — tool to read a Toyota RA86/93C86 immobilizer EEPROM
Xhorse Multi-Prog
EEPROM · Clip
HexProg (Microtronik) — tool to read a Toyota RA86/93C86 immobilizer EEPROM
HexProg (Microtronik)
EEPROM · Clip

Also supported: CarProg · Orange5 · XProg · UPA-USB · any 93C86 Microwire programmer.

Product names and images indicate tool compatibility only. We are not affiliated with, or endorsed by, these manufacturers.

Frequently asked

Which cars does this cover?
Right now, exactly one confirmed unit: the 2006 Toyota Avalon 3.5L 2GR-FE, Denso ECU 89661-07450 / TN275100-5581, with an RA86 (93C86) immobilizer EEPROM read in x16 organization. We byte-verify your exact file before charging anything — if it is not this specific ECU, you are not charged and we route you to mail-in so it can be evaluated by hand.
What file do I upload?
The immobilizer EEPROM dump only — a full 2048-byte read of the RA86/93C86 chip inside the ECU, pulled with a chip programmer or bench clip. Not the main engine flash.
Does it fix a checksum?
No checksum step is needed or performed. This EEPROM is data (VIN, key state), not executable code — there is no known checksum covering it. The patch changes a single 3x-redundant status word and leaves the VIN, a validity marker, and the rest of the EEPROM byte-for-byte untouched.
How fast do I get the file back?
Seconds. You upload, we byte-verify the exact file, you pay, and the immo-off dump downloads immediately. Write it back to the EEPROM with your own programmer.
What if my dump is not recognized?
If the file is not this exact ECU’s EEPROM, nothing is written, you are not charged, and we route you to mail-in. We never guess on a live immobilizer write.
Is this legal?
This service is for diagnostics, repair, engine-swap and standalone builds, motorsport, and off-road use where legally permitted. We do not provide emissions defeat or anything intended to bypass emissions laws or to enable vehicle theft. You are responsible for lawful ownership and compliance with all local, state, and federal law.

Ready in seconds — upload your dump

A matching ECU 89661-07450 EEPROM dump is processed and returned online for $150. We verify your exact file first — nothing happens if it isn't supported.

Upload your EEPROM dumpSee all calculators

For diagnostics, repair, engine-swap and standalone builds, motorsport, and off-road use where legally permitted. We do not provide emissions defeat, delete files, or services intended to bypass emissions laws or to enable vehicle theft. The customer is responsible for lawful ownership of the vehicle and compliance with all local, state, and federal law.