2008 Acura MDX
No-Wait Key Service in Ventura County

Q: How long should a replacement flip key last?

Electronics wise, as long as the original. The immobilizer data does not wear out. What fails on these is the hardware. Acura released bulletin 10-008 because the retractable master key could stop locking in the extended position. The fix was replacing the key case and transferring the transmitter and transponder, then rewriting the immobilizer code with HDS. I see cracked shells, loose hinge pins, and worn buttons. The board itself usually survives. When the case fails, we can often rebuild it without changing the programmed data.

Q: What if the new key stops starting the car?

Call me. On this MDX, a no start with a flashing green key light means the immobilizer is not recognizing the transponder code. The owner’s manual spells it out. If the system does not recognize the coding, the engine will not start. That can be a bad chip, incorrect programming, or low system voltage. I scan the immobilizer and PCM, confirm key registration, and retest before I leave Rose Shopping Center. If something acts up later, I come back and sort it.

Q: Can I program a 2008 MDX key myself?

Remote buttons, maybe. Immobilizer, no. The door lock remote can be synced through an ignition cycle procedure if you already have a working master key. But the Philips ID46 transponder inside that key has to be registered to the Type 6 immobilizer with professional software. Acura’s own bulletin for retractable key service calls for HDS and an immobilizer password before rewriting key data. All keys lost means everything gets erased and re added. There is no pedal trick for that.

Q: Why does my MDX crank and then stall with the green key light flashing?

That is classic immobilizer behavior on this platform. The 2007 to 2009 MDX uses the Type 6 GEN4 immobilizer. If the receiver around the ignition cylinder does not read a valid ID46 chip, it will allow crank but cut fuel almost immediately. Common causes I see in Oxnard are weak vehicle batteries, damaged key heads, or someone had the key case replaced and lost the transponder chip during the swap. Diagnosis starts with voltage and a scan, not guessing.

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Friday night at the Rose Shopping Center in Oxnard. A couple standing next to their 2008 Acura MDX, hood up, hazard lights blinking.

The key would turn. It would crank. Then it would die. On the dash, the green key indicator kept flashing at them.

They thought the immobilizer had wiped itself because the battery had gone low earlier in the week. That is not how the Type 6 system works. This generation stores key data in the immobilizer unit. It does not forget just because voltage dips.

Their flip key was the 4 button N5F0602A1A, part number 35111-STX-329, Driver 2 on the back. CR1616 inside. The remote was weak and the shell hinge had play, which is common enough that Acura put out bulletin 10-008 for retractable master keys not locking in the extended position on 2007 to 2012 MDX.

I tested voltage, confirmed the immobilizer receiver was alive, and scanned for codes. No hard faults. Just low battery history.

Fresh battery in the vehicle. Fresh CR1616 in the key. Cleared codes. The green key light went out like it should. Engine stayed running.

They drove home that night. No tow. No waiting until Monday. Just the right fix in the parking lot.

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2008 Acura MDX

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Do you use OEM or aftermarket keys for a 2008 Acura MDX?▼

For this MDX, matching the correct FCC ID and chip matters more than the logo on the shell. Your flip key is FCC ID N5F0602A1A, typically 314 MHz, with a Philips ID46 transponder inside. Acura used both 3 and 4 button versions under similar part numbers like 35111-STX-325 and 35111-STX-329, plus Driver 1 and Driver 2 variants tied to memory settings. I verify frequency, chip type, and driver designation before I ever cut the HON66 blade. If it does not match your immobilizer and memory setup, it does not go in your ignition.

How long should a replacement flip key last?▼

What if the new key stops starting the car?▼

Can I program a 2008 MDX key myself?▼

Why does my MDX crank and then stall with the green key light flashing?▼

Questions? Call (805) 790-8162