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I just had my cats replaced(up stream) after changing the cats and the sensors, I get a p0133 & p0153 code. I reset the learned air flow ratio value by unplugging the mass air flow sensor, but the codes keep coming up. Need help is there anything else I can try?
 

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P0133 NISSAN Possible Causes
  • Faulty Air fuel ratio (A/F) sensor 1 bank 1
  • Air fuel ratio (A/F) sensor 1 bank 1 harness is open or shorted
  • Air fuel ratio (A/F) sensor 1 bank 1 circuit poor electrical connection
  • Inappropriate fuel pressure
  • Faulty fuel injectors
  • Intake air leaks may be faulty
  • Exhaust gas leaks
P0153 NISSAN Possible Causes
  • Air fuel ratio (A/F) sensor 1 bank 2 harness is open or shorted
  • Air fuel ratio (A/F) sensor 1 bank 2 circuit poor electrical connection
  • Faulty Air fuel ratio (A/F) sensor 1 bank 2
  • Inappropriate fuel pressure
  • Faulty fuel injectors
  • Intake air leaks
  • Exhaust gas leaks
 

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If these DTCs triggered only after replacing the OE catalytic converters, it’s likely there are exhaust leaks. Were the new converters welded in place of the OE converters? Complete manifold(s) swap? If so, were OE Nissan manifold gaskets used?
With a full range diagnostic tool, looking at the short term fuel trims helps in ruling out exhaust/manifold leaks.
 
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