service indicator Lexus GS450h 2007 Hybrid system / LEXUS 2007 GS450H THROUGH JUNE 2006 PROD. OWNER'S MANUAL (OM30727U)

354
4-2. Maintenance
Emission inspection and maintenance (I/M) programs
Some states have vehicle emission inspection programs which include
OBD (On Board Diagnostics) checks. The OBD system monitors the oper
-
ation of the emission control system.
■ If the malfunction indicator lamp comes on
The OBD system determines that a pr
oblem exists somewhere in
the emission control system. Your vehicle may not pass the I/M test
and may need to be repaired. Contact your Lexus dealer to service
the vehicle.
■ Y
our vehicle may not pass the I/M test:
●When the 12 v
olt battery is disconnected or discharged
Readiness codes that are set during ordinary driving are erased. 
Also, depending on your driving habits, the r
eadiness codes may
not be completely set.
● When the fuel tank cap is loose
The malfunction indicator lamp comes on as a tempor
ary mal-
function and your vehicle may not pass the I/M test.
■ When the malfunction indicator la mp goes off after se
veral driv-
ing trips
The error code in the OBD system will not be clear
ed unless the
vehicle is driven 40 or more times.
■ If y
our vehicle does not pass the I/M test
Contact your Lexus dealer to prep ar
e the vehicle for re-testing.

490
6-1. Specifications
■Gasoline quality standards
●Automotive manufacturers in the US, Europe and Japan have developed a
specification for fuel quality called World-Wide Fuel Charter (WWFC) that is
expected to be applied worldwide.
●The WWFC consists of four categories that are based on required emission
levels. In the US, category 4 has been adopted.
●The WWFC improves air quality by lowering emissions in vehicle fleets, and
customer satisfaction th rough better performance.
■Lexus recommends the use of gasoline containing detergent additives
●Lexus recommends the use of gasoline that contains detergent additives to
avoid build-up of engine deposits.
●All gasoline sold in the US contains de tergent additives to clean and/or keep
clean intake systems.
■Lexus recommends the use of cleaner burning gasoline
Cleaner burning gasoline, including reform ulated gasoline that contains oxygen-
ates such as ethanol or MTBE (Methyl Tertiary Butyl Ether) is available in many
areas.
Lexus recommends the use of cleaner burning gasoline and appropriately blended
reformulated gasoline. These types of gasoline provide excellent vehicle perfor-
mance, reduce vehicle emissions and improve air quality.
■Lexus does not recommend blended gasoline
●Lexus allows the use of oxygenate blended gasoline where the oxygenate con-
tent is up to 10% ethanol or 15% MTBE.
●If you use gasohol in your Lexus, be sure that it has an octane rating no lower
than 87.
●Lexus DOES NOT recommend the use of gasoline containing methanol.
■Lexus does not recommend gasoline containing MMT
Some gasoline contains octane enhancin g additive called MMT (Methylcy clopen-
tadienyl Manganese Tricarbonyl).
Lexus DOES NOT recommend the use of gasoline that contains MMT. If fuel con-
taining MMT is used, your emission control system may be adversely affected.
The malfunction indicator lamp on the inst rument cluster may come on. If this hap-
pens, contact your Lexus dealer for service.

515
Alphabetical index
Emergency Locking Retractor 
(ELR) ........................................................44
How to wear your seat belt.............. 42
How your child should wear 
the seat belt.......................................... 45
Pre-collision seat belts........................ 44
Pregnant women, 
proper seat belt use..........................44
Reminder light..................................... 433
Seat belt extenders .............................. 45
Seat belt pretensioners....................... 43
Seat heaters................................. 324, 326
Seat ventilators....................................... 326
Seating capacity ..................................... 173
Seats Child seats/child restraint 
system installation ............................. 83
Cleaning ................................................ 346
Driving position memory ................. 36
Head restraint ........................................ 39
Properly sitting in the seat................. 67
Seat adjustment ...................................... 34
Seat adjustment precautions ........... 34
Seat heaters.............................. 324, 326
Ventilated seats .................................. 326
Service reminder indicators .............. 115
Shift lever If the shift lever cannot be 
shifted from P ................................... 467
Transmission .......................................... 104
Shift lock system .................................... 467
Shopping bag hooks ........................... 332
Side airbags ................................................ 69
Side marker lights Switch ........................................................ 120
Side mirror Adjusting and folding ......................... 50Driving position memory ..................
36
Smart access system with 
push-button start Antenna location ..................................... 16
Entry function ............................................ 14
Starting the hybrid system ................ 101
Spare tire Inflation pressure ................................ 487
Spare tire ................................................ 457
Spark plug................................................ 484
Specifications ........................................ 480
Speedometer ............................................ 110
Steering wheel Adjustment ............................................... 48
Audio switches................................... 260
Driving position memory .................. 36
Storage compartment ......................... 314
Storage feature......................................... 311
Stuck If your vehicle becomes stuck ..... 478
Sun visors ................................................... 317
Switch Fog light switch ..................................... 123
Light switches ....................................... 120
Mode select switch ............................ 105
Power door lock switch .................... 26
Power switch........................................... 101
Power window switch ........................ 52
Window lock switch............................ 52
Wipers and washer switch ............. 124
Tail lights Switch........................................................ 120
Theft deterrent system Alarm........................................................... 64
T