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After fixing you sometimes need to delete the fault codes that er registrered on your ECU "electronic control unit, or car computer". You do that by using the ODB device and on that device select to delete fault codes.
I assume that you performed a Clear Codes after doing this to reset the check engine light and then retested......otherwise the codes will remain until you do so.
PO171 is the 1st o2 sensor on bank 1. With that said a vacuum leak will also throw this same code so before I go changing an o2 sensor I would completely go over the engine and look for a vacuum line or intake leak. PO136 is the o2 sensor bank 1 the second sensor in the exhaust. Again here are some of the things that can cause this code. ( I always look for a vacuum leak somewhere first)
Hello,
The P0136 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor signal voltage is out of range for an extended period of time. bank 1 is the side of motor near the firewall that's where the #1 plug is. Replace the sensor and you'll be ok..
If 4 cylinder engine, there are only two O2 Sensors - Sensor 1 is on top, Sensor 2 is at the bottom
If 6 cylinder, there are four (4) O2 sensors (Bank1, Sensor2 is on the firewall side of this engine and is referred to as the 'DOWNSTREAM' sensor (the one AFTER the Catalytic Converter)
P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) P0136 02 Sensor Circuit Malfunction (Bank I Sensor 2) check for a blown fuse, if it is blown replace it, if it blows again after engine is started you have either a shorted O2 sensor or the wiring leading to the up stream or down stream sensors.
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