B1602 on 2007-2017 Lexus LS (LS460, LS460L, LS600h, LS600hL) — PATS Received Invalid Format of Key-Code From Ignition Key Transponder
1 vehicles · 1 makes · $400-$1,500 repair
How to diagnose and fix B1602: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Lexus LS · 2007–2017
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.
Common Symptoms
- Headlight leveling warning message on dashboard
- Headlights pointing too high or too low
- Headlights not adjusting when vehicle is loaded
- AFS (Adaptive Front-lighting System) warning light
How to Fix
Replace the failed headlight leveling sensor(s). There are typically 3-4 sensors on the LS — two front and one or two rear. Use OEM sensors as aftermarket alternatives have poor fitment. Recalibrate the headlight system with a Lexus diagnostic scan tool after replacement.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- 89405-50070 genuine Lexus front-right height sensorOEM89405-50070
Confirm RWD chassis and VIN against the current catalog before ordering.
- 89406-50100 genuine Lexus front-left height sensorOEM89406-50100
Confirm RWD chassis and VIN against the current catalog before ordering.
- 89405-50100 genuine Lexus front-right height sensorOEM89405-50100 (replaces 89405-50090)
Confirm AWD/hybrid chassis and VIN before ordering.
- 89406-50130 genuine Lexus front-left height sensorOEM89406-50130 (replaces 89406-50120)
Confirm AWD/hybrid chassis and VIN before ordering.
- 89407-50070 genuine Lexus rear-right height sensorOEM89407-50070
Confirm exact LS model, suspension equipment and VIN before ordering.
- 89408-50070 genuine Lexus rear-left height sensorOEM89408-50070
Confirm exact LS model, suspension equipment and VIN before ordering.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipBefore replacing sensors, check the sensor link rods first — they are plastic and break easily. A broken link rod is a $20 fix versus $300+ for a sensor.
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B1602 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does B1602 mean?
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.
What are the most common causes of B1602?
The most common causes of B1602 are: 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. The specific cause varies by vehicle.
How much does it cost to fix B1602?
Repair costs for B1602 range from $400 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by B1602?
Au7o has documented B1602 across 1 vehicle models from 1 manufacturers: Lexus.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.