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  1. S

    P0135 and P0155 - 02 Sensor Heater Circuit Malfunction Solved Finally

    Forgot to say, If you have a 195 thermostat and you have similar problems the thermostat could be stuck open, causing long heat up time, lower engine temp. setting DTC, CEL
  2. S

    P0135 and P0155 - 02 Sensor Heater Circuit Malfunction Solved Finally

    Forgot to say, If you have a 195 thermostat and you have similar problems the thermostat could be stuck open, causing long heat up time, lower engine temp. setting DTC, CEL
  3. S

    P0135 and P0155 - 02 Sensor Heater Circuit Malfunction Solved Finally

    Guy's I always used NTK, I have a collection of them. The fix was getting engine to temp faster with Spec 195 thermostat. Jeep is running better than ever. Never came across this fix in all my searches. Hope this helps someone with same situation.
  4. S

    P0135 and P0155 - 02 Sensor Heater Circuit Malfunction Solved Finally

    I have a 2003 Wrangler Sport 4.0 5 speed For the past year or more I have been chasing code P0135 and P0155 - 02 Sensor Heater Circuit Malfunction (Bank I Sensor 1, Bank 2 Sensor 1) Replaced O2 sensors multiple times, checked wiring everything spot on. The fix Wrong Thermostat. I replaced...
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