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P0 432 and 455

leadfoot77

NAXJA Forum User
Location
ill in ILLINIOIS
ENGINE CODES P0 432 and 455?

Check engine light came on pulled these codes up

PO 432 main catalyst efficency below thresh hold B2... Any ideas bad O2 sensor?
and
PO 455 evap emission system leak-gross leak..

i know the code 455 is gas cap i swapped it out any other ideas?

thanks
01 Limited 4x4
" Its not a @&%$ SUV it's a CARRY ALL"
 
Last edited:
The P0432 code could be caused by either a catalytic converter wearing out, or 'lazy' O2 sensors. The before cat and after cat O2 sensor outputs are compared by the ECU, and if they are out of a range differential, a P0432 code is set. The only way to check for sure is with a scanner.

I'd guess it's either a tired after-cat O2 sensor, or as XgeekstarX said, a worn-out cat converter. (If it were a bad front O2 sensor, you'd probably get a 'slow response' code for it.....)
 
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