Northstar Engines and System Technical Discussion Discussion, P0420 Code in Cadillac Engine Technical Discussion; Salvaging the rest of a rusty system is IFFY. Chances are they will not try and require the rest to ...
I just was looking on GM Parts Direct and they list that for the cat converter and the rest of the exhaust behind it is sold as a kit for 1200 bucks?????
If the dealer has to replace the cat can they just replace the cat or do they have to replace the entire exhaust system????
2002 was a VERY bad year at GM for cats LOTS of failure across ALL car lines ... ONE TSB after another on this issue...
My 2002 STS had the cat die at 70,000 miles while still on the Federal warranty... The GM replacement cat is not a "complete" unit... It is a cut and clamp replacement. Nice
If you have a P0420 code and you have 2002 GM anything you have a bad cat. Ask your parts guy for the TSB replacement part for your car if you must have OEM (expect ~500-800) for just the cat... Cut and clamp.
If mine were to fail off warranty it would be in line for an aftermarket one... "quality" "factory fit" aftermarket cats go for 80-160.. You can replace that cat about 5-10 time... I'm sure that GM has fixed the issues with the 2002 cats.. but I'm still nervous about mine and it hangs down about 2" lower then the "original" one.
Stealership is going to replace the Cat but they are trying to charge me the Diagnostics fee. I'm fighting it. I called Caddy Customer Service and hopefully they can work it out with the stealership.
It is ALL covered under the waranty... including the diagnostic fee
TSB: Service Engine Soon (SES) Light On, Reduced Vehicle Power/Acceleration/Speed, Diagnostic Trouble Code (DTC) P0420 (Diagnosis and Replace Catalytic Converter) #03-06-04-028 - (May 15, 2003)
Service Engine Soon (SES) Light on, Reduced Vehicle Power/Acceleration/Speed, Diagnostic Trouble Code (DTC) P0420 (Diagnosis and Replace Catalytic Converter)
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 .
<LI type=1>For diagnostic information, refer to DTC P0420 SI Document ID #792317 <LI type=1>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.
<LI type=1>Support the exhaust system near the resonator with a suitable adjustable jack.
<LI type=1>Remove the 4 nuts securing the catalytic converter to the rear exhaust manifold pipe.
<LI type=1>Remove the 2 bolts securing the center exhaust hangers to the rear suspension support brackets. <LI type=1>Remove the catalytic converter from the rear exhaust manifold pipe. <LI type=1>Remove the catalytic converter gasket and discard the gasket. Important
Use care not to overextend the heated oxygen sensor pigtail.
<LI type=1>Lower the exhaust system with the adjustable jack to allow clearance for the cut-off tool.
Ensure the cut is made on the catalytic converter side of the pipe.
<LI type=1>Cut (2) the catalytic converter (3) from the resonator inlet pipe (1) ahead of the step but as close to the step as the tool will permit. <LI type=1>Remove and properly discard the catalytic converter. Important
<LI type=a>DO NOT REPLACE the following complete exhaust systems when replacing the catalytic converter.
Ensure the catalytic converter heat shield is upward. The "honeycomb" side faces downward.
<LI type=1>Slide the new catalytic converter, P/N 25755681, onto the resonator inlet pipe until it is fully seated against the heated oxygen sensor boss. <LI type=1>Install a new exhaust seal, P/N 03544534, on the four studs. <LI type=1>Install the converter onto the rear exhaust manifold pipe. <LI type=1>Install the four nuts securing the catalytic converter to the rear exhaust manifold pipe. <LI type=1>Install the 2 bolts securing the center exhaust hangers to the rear suspension support brackets. Tighten
<LI type=a>Tighten the catalytic converter nuts in a crisscross pattern to 25 Nm (18 lb ft).
Tighten the center exhaust hanger bolts to 30 Nm (22 lb ft).
Ensure the catalytic converter outlet pipe is fully seated against the heated oxygen sensor boss.
<LI type=1>Install two exhaust clamps, P/N 15992529, on the converter pipe with the two clamp ends 180 degrees from each other. Each set of clamp nuts should face opposite directions for proper sealing. Tighten Tighten the service clamp nuts to 30 N·m(22 lb ft),
<LI type=1>Remove the adjustable jack stand.
Lower the vehicle and inspect for exhaust leaks.
Nut (Only Order As Needed)
Gasket, Catalytic Converter
Parts are currently available from GMSPO. Warranty Information
For vehicles repaired under warranty, use:
Catalytic Converter Replacement
0.0 -- 0.3 hr
well that's it i'm finished with gm. The service manager would not reverse the charge for the diagnostics fee. He said because the car is not under the orginial warranty that i am responsible for the diag fees.
I am so pissed right now. I paid it anyways, so hopefully once i here back from Cadillac Customer Service they will do something about this.
Hopefully i am not screwed cause i paid for the diag fee so i could get my car back.
from the manual!!!!!
Your Rights and Obligations (For Vehicles Subject to
California Exhaust Emission Standards)
The California Air Resources Board and General Motors
are pleased to explain the emission control system
warranty on your 2002 vehicle. In California, new
motor vehicles must be designed, equipped, and built
to meet the states’ stringent anti-smog standards. GM
must warrant your vehicle’s emission control system
for the periods of time and mileage listed provided there
has been no abuse, neglect, or improper maintenance of
your vehicle. Your vehicle’s emission control system
may include parts such as the fuel injection system,
ignition system, catalytic converter, and engine
computer. Also included are hoses, belts, connectors,
and other emission related assemblies.
Where a warrantable condition exists, GM will repair
your vehicle at no cost to you including diagnosis,
parts and labor.