DeVille DTS V8-4.6L VIN 9 (2002)
Catalytic Converter: Customer Interest
Emissions - SES lamp ON/Low Power/DTC P0420 Set
Bulletin No.: 03-06-04-028
Date: May 15, 2003
TECHNICAL
Subject:
Service Engine Soon (SES) Light on, Reduced Vehicle Power/Acceleration/Speed, Diagnostic Trouble Code (DTC) P0420 (Diagnosis and Replace
Catalytic Converter)
Models:
2002-2003 Cadillac DeVille, Seville
Condition
Some customers may comment of the SES light on and/or possible reduced vehicle power, acceleration and reduced top speed. DTC P0420 may be set.
Cause
The catalytic converter efficiency may be too low and/or restricted.
Correction
Follow the service procedure below for catalytic converter diagnosis and replacement.
1.
For diagnostic information, refer to DTC P0420 SI Document ID # 792317
2.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle SI Document ID # 377101.
Caution:
^
In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.
^
Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components
could result in serious personal injury.
3.
Support the exhaust system near the resonator with a suitable adjustable jack.
4.
Remove the 4 nuts securing the catalytic converter to the rear exhaust manifold pipe.
