B1602 on Lexus
PATS Received Invalid Format of Key-Code From Ignition Key Transponder
B1602 on Lexus vehicles indicates pats received invalid format of key-code from ignition key transponder. Au7o has documented this code across 1 Lexus model — most commonly on LS. This is a Ford-family body code from the Passive Anti-Theft System (PATS), the immobilizer that verifies your key before allowing the engine to start. The module read the transponder chip in the key but received a code in an invalid or unrecognized format, so it could not confirm the key is authorized. The result is often a no-start or stall condition with the security/theft light illuminated. It usually points to a key, transponder, or anti-theft antenna problem rather than an engine fault. Typical repair costs on Lexus range from $400 to $1,500, depending on the specific model and root cause.
Common Causes of B1602
- •Damaged, demagnetized, or non-programmed (non-PATS) key transponder
- •Unprogrammed aftermarket or duplicate key being used
- •Faulty or misaligned transceiver antenna ring around ignition lock
- •Interference from other transponders or metal objects on the key ring
- •Wiring or connector fault between the antenna and module
- •Weak key fob or vehicle battery affecting the read
- •Faulty PATS/anti-theft control module
B1602 on Lexus by Model
Lexus LS(1 issue)
- Self-Leveling Headlight System Failure2007-2017
The adaptive self-leveling HID headlight system fails due to deterioration of the headlight level sensors mounted at the front and rear suspension. The sensors develop internal failures from exposure to road debris and moisture, causing the headlights to aim incorrectly or trigger warning lights. Replacement sensors are expensive OEM-only parts.
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View B1602 across all makes →Frequently Asked Questions
What does B1602 mean on Lexus?▼
B1602 stands for "PATS Received Invalid Format of Key-Code From Ignition Key Transponder." This is a Ford-family body code from the Passive Anti-Theft System (PATS), the immobilizer that verifies your key before allowing the engine to start. The module read the transponder chip in the key but received a code in an invalid or unrecognized format, so it could not confirm the key is authorized. The result is often a no-start or stall condition with the security/theft light illuminated. It usually points to a key, transponder, or anti-theft antenna problem rather than an engine fault. On Lexus specifically, this code is documented across 1 model.
What causes B1602 on Lexus vehicles?▼
Common causes on Lexus: Damaged, demagnetized, or non-programmed (non-PATS) key transponder, Unprogrammed aftermarket or duplicate key being used, Faulty or misaligned transceiver antenna ring around ignition lock, Interference from other transponders or metal objects on the key ring, Wiring or connector fault between the antenna and module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B1602 on a Lexus?▼
Repair costs on Lexus range from $400 to $1,500, depending on the specific model and root cause.
Which Lexus models have B1602 documented?▼
Au7o has documented B1602 on 1 Lexus model: LS.