Check Engine Light & P0141 After O2 Sensor Replacement

aghutter · 2012-03-04T23:43:34+00:00

Recently bought a 00 SR5 w/3.4L, 173K miles from a friend. Check engine light on with codes for both O2 sensors. Replaced both O2 sensors with Bosch sensors (california emissions model) and the check engine light continues to stay illuminated. I have reset the OBD II codes using diagnostic tool and disconnected the pos battery terminal for abt 10 mins, both times the check engine lights come back on with the 2nd start. Codes P0141 and P0141 pending. A local mechanic told me before I replaced the sensors that it could take some time for the light to go off, as the computer has "learned" to stop recieving data from that sensor and has to r-learn to accept data from that sensor. Anyone have any experience with this? Any help would be GREATLY appreciated. Thanks!

Thread starter aghutter
Start date Mar 4, 2012

onemanarmy

Member

Feb 23, 2019

I'm still battling mine as well.

I've sent my ECU in for testing/repair (if needed)

From my understanding, the simulators are for O2 sensor readings (emission levels) and the heater would still be in the circuit with the simulators. They are useful for removing the CAT and not for the 'heater circuit' codes