Here are the reasons for that code:
HO2S no. 1 heater circut is open or shorted
HO2S no. 1 is defective
Defective ECM
Using a scan tool, read freeze frame data. Freeze fram data records engine conditions when a malfunction is detected.
Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe
ECM harness connector. If DTC P0135 is set, measure voltage between
ground and terminal No. 3 (Blue/Black wire) at ECM harness connector
E10. If DTC P0155 is set, measure voltage between ground and terminal
No. 4 (Yellow/Red wire) at ECM harness E10. Voltage should be 9-14
volts at each terminal. If voltage is as specified, replace ECM.
If not, Disconnect suspect HO2S No. 1 harness connector. Measure
resistance between terminals B+ (Black/Yellow wire) and HT (Blue/Black
wire on bank No. 1 ; Yellow/Red wire on bank No. 2) at HO2S connector
(component side). Resistance should be 11-16 ohms at 68 degrees F and
23-32 ohms at 1472 degrees F. If resistance are not specified, replace
appropriate HO2S. If resistance are specified, Repair wiring between
ECM and appropriate HO2S, or between appropriate HO2S and EFI main relay
(Black/Yellow wire at HO2S and Red wire at EFI main relay)
I have a 03 dodge caravan and just had the test done i got the code p0135 o2 hearer sensor bank 1 sensor 1 how do i know if its up stream or downstream?
thanks Casandra
SOURCE: diagnostic code p0135
What engine is in this vehicle? I assume the avalon would be a 3.0L or similar V6 engine. Bank 1 sensor one indicates one of the primary O 2 sensor controlling a/f ratio. Sensor one bank one would be the sensor located in the Front manifold, closest to the engine. Hope this solves your issue. I would first check the conector at this sensor for corrison before buying a new sensor.
If your check engine light is on and you have a diagnostic trouble code P0135 stored in the PCM's memory... then you've come to the right place to test and troubleshoot the upstream oxygen sensor.
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