3.1.13-196
CS35 2013.04
3.1.13-196Electronic Control System - ME7
DTC P0420
1. DTC Description
2. Possible Sources
3. Diagnosis Procedures
Fault Code Description Definition
P0420
Three - way catalytic converter
oxygen storage capacity aging
(exceed the emission limits)
-
Fault
Code
Test Tactics
Setting Conditions (Control
Strategy)
Fault
P0420
Hardware and cir-
cuit inspection
-
• Oxygen sensor fault
• Catalytic converter
• Mechanical fault
Test Conditions Details/Results/Actions
1. General inspection
A. Inspect the catalytic converter for following damage.
• There is damage, dent or hole in catalytic converter.
• As catalytic converter is too hot lead to serious dis-
coloration.
• There is fracture inside the catalytic converter. Cata-
lytic converter is leaking.
Is it normal?
Y
Go to step 2.
N
Replace catalytic converter.
2. Inspect the exhaust gas leakage
A. Start the engine.
B. Inspect if there is exhaust leakage between engine
and pre - catalytic oxygen sensor.
C. Inspect if there is exhaust leakage between engine
and post - catalytic oxygen sensor.
Is there any exhaust leakage?
Y
Repair the leakage fault.
N
Go to step 3.
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