P0420 code, high B1S1 O2 voltage

Tiny
RLANELKN
  • MEMBER
  • 2010 NISSAN CUBE
  • 160,000 MILES
Vehicle is throwing P0420, catalytic converter was replaced last year (but son drove it around campus for months with code returned). Live data from OBD reader shows B1S1 volts at 2.2 range, steady. B1S2.6 range with occasional drop. Catalytic converter temperature 500 area. Suspect B1S1 sensor but wondering about possible exhaust manifold leak. Ideas? Thanks.
Tuesday, July 18th, 2017 AT 8:59 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
See pictures for causes and where to check for leaks. Also, bs2 seems to be okay from chart if operated like it says. Keep in mind any leakage on exhaust or intake side can set off a 420 code as well as bad O2 sensors.
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Tuesday, July 18th, 2017 AT 9:48 AM

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