1998 Toyota Camry CHECK ENGINE CODE

1998 TOYOTA CAMRY
89,000 MILES • 4 CYL • 2WD • AUTOMATIC
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REDBOY76053
  • MEMBER
  • 1 POST
p0420 CAYALYST BANK1 IS THE CULPRIT, AFTER 3 ATTEMPTS TO CLEAR THIS ISSUE IT STILL REMAINS, 1. REPLACED VSV, 2. REPLACED EGR, 3 REPLACED O2SENSOR, CAN YOU NARROW IT DOWN?
Nov 22, 2009 at 8:24 AM
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BMRFIXIT
  • ✓Experienced Mechanic
  • 19,053 POSTS
The ECM monitors heated oxygen sensor located after converter to determine if converter performance has deteriorated. If converter is functioning properly, heated oxygen sensor waveform switches back and forth between rich and lean more slowly. DTC is set when both heated oxygen sensors have same amplitude after vehicle is driven for 5 minutes at 20-50 MPH. Possible causes are:
Catalytic converter.
Oxygen sensor open or short circuit.
Oxygen sensor.
Air/Fuel Ratio Sensor (AFS).
AFS open or short circuit.
Nov 22, 2009 at 8:42 AM
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