Infiniti Qx4 Key Replacement Across San Diego County (1999-2003)

Yes, but only for the remote buttons, not the transponder. Close all doors, lock with the driver-side switch, then insert and remove the key from the ignition six times within ten seconds until the hazards flash. That pairs the remote. The chip side, the part that actually starts the engine, requires OBD-II registration through NATS. Call (619) 876-1271 and Marco will be at your San Diego County address same day.

Every 1999 through 2003 QX4 uses a Texas 4D-60 chip (also called ID46) in a standard blade transponder key. That chip communicates with your NATS immobilizer system every time you turn the ignition. If someone sells you a key blank without a chip, it will turn the ignition but the engine will not start. We carry the correct chipped blanks on every truck and program them through the OBD-II port, so you are driving again the same visit.

Start by testing with a different key if you have one. If a known good key also will not start the car, the problem is likely the NATS immobilizer antenna ring or the ignition cylinder itself, not the transponder. If the other key works fine, then yes, the Texas 4D-60 chip in your problem key has probably failed. The dealer charges $250 to $500 for this. We do it mobile in Carlsbad, Escondido, or wherever you are in San Diego County for significantly less. Call us at (619) 876-1271 and we will diagnose it on the spot before you pay for anything.

No. Every 1999 through 2003 QX4 uses a traditional mechanical key with a transponder chip and a three-button remote. There is no push-button start, no proximity sensor, no smart key system. You insert the key, you turn it, the NATS system reads the chip, and the engine starts. Simple and reliable. It also means replacement keys are straightforward and less expensive than modern smart key systems.