How to Change Downstream Oxygen Sensor Hyundai Tuscon
How to Change Downstream Oxygen Sensor Hyundai Tuscon: Vehicle is a 2015 Hyundai Tucson 2.4 liter engine. Procedure for replacing O2 sensor on 2.0L engine is more or less same as 2.4L but O2 sensor is located in a different location, after catalytic converter on bottom exhaust pipe. Actually, downstream O2 sensor is easier to replace on 2.0L engine.
Hyundai Tucson oxygen sensor cost anywhere between $50 to $120 depending on sensor brand. Amazon and Rockauto has them for about $50. However, make sure to buy the right sensor for model, year and engine.
Hyundai Tuscon Downstream Oxygen Sensor Failure
Downstream O2 sensor does not affect engine operation, its only a monitoring sensor. Sensor measures amount of oxygen to verify proper operation of catalytic converter Downstream O2 sensor will trigger a check engine light if catalytic converter fails, “Catalytic Converter Below Efficiency” with trouble code P0420.. Details on: Oxygen Sensors.
Most common problem with downstream sensor is failure of heating element. Check engine light will be triggered with P0036 trouble code.If oxygen sensor completely fails, then code P0136 will be triggered. Replace oxygen sensor in both cases.
Tools
Oxygen sensor is 22mm and you will need an Oxygen Socket to remove it. O2 sensors most often than not are seized by exhaust heat and you wont be able to remove it with a 22mm open wrench. Use a O2 sensor socket or tool.
O2 sensor removal tools or sockets are cheap, you can purchase online for about $15 or so.
Hyundai Tuscon Downstream Oxygen Sensor Location
Downstream oxygen sensor is located behind catalytic converter and monitors condition on catalytic converter.
O2 sensor is not accessible from the top, you will have to lift the vehicle to gain access to it.
First remove engine cover. Cover is a plug in type, has no screws or bolts. Pull engine cover upwards and remove it.
Image above (red arrow) shows location of oxygen sensor electrical connector behind engine cover. Electrical connectors for both oxygen sensors (upstream and downstream) are located on the same place, side by side. O2 sensor connectors are very accessible.
Downstream O2 sensor electrical connector is the one on the outer edge, easier to reach. Follow the wire from oxygen sensor to see exactly where connector is. Image above marked in red.
Unplug downstream O2 sensor connectors, press on locking tab while pulling on connector plug.
Image above shows downstream and upstream O2 sensors connectors. Downstream electrical connector is already disconnected (red arrow). Green arrow is upstream sensor connector, you don’t need to move that one.
Oxygen sensor connector is fixed on a metallic flange (image above). Use a screwdriver to release it from holding clip. Image above red arrow shows metallic flange where O2 sensor connector is fixed in place.
How to Change Downstream Oxygen Sensor Tuscon
Assuming you already unplugged oxygen sensor and wire is now free, insert O2 sensor socket on oxygen sensor and use a ratchet to unscrew it. As we said, sensor is likely seized and will take some force to remove it.
Unscrew oxygen sensor completely and remove it from exhaust line. Insert and screw new oxygen sensor, use ratchet and socket to tighten it, firmly. Initially screw new sensor by hand only, therefore making sure new oxygen sensor goes in straight.
Plug oxygen sensor electrical connector back in place and install engine cover.
Remove codes with Obd2 scanner, or if you dont have one then remove battery negative terminal for few minutes. start the car and idle it for few minutes to check operation.
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