lambda sensor

2007 jimny
Need to find out what the oem bank 1 o2 sensor is having serious issues with it thanks.

Your Jimny should have two O2 sensors, both bank 1, labelled bank 1 sensor 1 (in front of the CAT) and bank 1 sensor 2 (after the CAT).

Sensor 1 should oscillate between 0.2 and 0.8v about once ever second or so at idle and sets the mixture (rich/lean).

Sensor 2 should be fairly steady (around 0.45V) but will go up to 0.9V under acceleration and 0.1V on the over run. Sensor 2 largely just measures the performance of the CAT, but might help to se5 the long term fuel trim.

Is your Jimny showing fault codes and if so what are they?

Fault code reads
P0032 Ho2s heater control circuit high Bank 1 sensor 1
Replaced sensor plugs gone so wired directly into harness. Still showing code . Maybe not the perfect match or Ecu bad idle rough and bad on fuel
Many thanks

Hi,

This fault code is saying that the voltage from the O2 sensor is too high, so suspect a wiring problem, especially as you wired directly in to the harness.

If the O2 sensor is like others it will have two heater wires and two wires from the sensor, the heater wires are not polarity sensitive, but the sensor wires are.

I suggest you check the connections to make sure that the new sensor is wired correctly, a mistake in the wiring could cross link the heater circuit on to the sensor output and that would give you high voltage.

Also how did you joint the new sensor in place, did you use the special purpose crimp connector, any old crimp or solder? The web boards say don't solder as the voltage from the sensors is so small that the solder resistance can cause problems.

Perhaps there is a high resitance joint on the heater circuit, that might throw out a P0032 code.

Finally, did you use a compatible or original sensor? Sensors have different characteristics, perhaps post your part number and we can check?