Got 165k on 04 LC100
Replaced oxygen sensor 1/bank 1 last year, sensor 1/bank 2 few weeks ago - both were shown as errors P0135 (?) and P0051 in OBD II
Reset all errors. Now I get P0420 after driving about 50 miles. Sometimes check engine light (and VSC Off + 1 more) comes on sometimes it does not. I reset the code, drive 50 miles - get an error again.
EVAP canister was replaced at around 60k.
Got new rear muffler few months ago. Whole exhaust from CAT to the end was replaced at around 60k.
What is the best way to approach this issue?
Replace O2 sensors 2 (after the CAT)? Measure voltage? Try premium gas (I am running on regular)? Something else?
I need to pass inspection and really do not want to be spending money on EVAP canister and/or Catalytic converters.
Replaced oxygen sensor 1/bank 1 last year, sensor 1/bank 2 few weeks ago - both were shown as errors P0135 (?) and P0051 in OBD II
Reset all errors. Now I get P0420 after driving about 50 miles. Sometimes check engine light (and VSC Off + 1 more) comes on sometimes it does not. I reset the code, drive 50 miles - get an error again.
EVAP canister was replaced at around 60k.
Got new rear muffler few months ago. Whole exhaust from CAT to the end was replaced at around 60k.
What is the best way to approach this issue?
Replace O2 sensors 2 (after the CAT)? Measure voltage? Try premium gas (I am running on regular)? Something else?
I need to pass inspection and really do not want to be spending money on EVAP canister and/or Catalytic converters.