A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
Possible causes
- The oxygen sensor is aged or contaminated (oil, coolant, additives)
- An air leak or an exhaust leak before the sensor
- The oxygen sensor connector or wiring: corrosion, melted wires near the exhaust
What you can do yourself
- Look at the sensor in the scan tool’s live data: on a warm engine the voltage should switch quickly between 0.1 and 0.9 V.
- Check for air leaks and exhaust leaks before the sensor: hissing, soot marks on the gaskets.
- Inspect the sensor connector and wires near the exhaust manifold: melted or chafed wires are a common cause.
Stop and don’t drive on if:
- The Check Engine light is flashing
- The temperature gauge is in the red or the overheating light is on
- The red oil pressure light is on
- Smoke from under the bonnet, a burning or petrol smell
- Strong jerking, knocking from the engine, or the car barely moves
OOleg’s tip: check the connector
Often the cause is simple — there is no contact in the connector (plug). Look at the connector from the back: remove the rubber seal and you will see whether a wire is corroded or has come off completely. Corrosion shows up as green deposits. Ideally, gently pull each wire towards you one at a time: a sound wire stays in place, while a corroded one simply comes off — it needs to be repaired.
Unplug and inspect connectors with the ignition off.
Find the part on Kaspi ShopBefore buying, check the part number or match the part by VIN in the Kaspi “Garage”.
Bank 2 exists only on V6 engines — it is the cylinder bank without cylinder 1. This is the Hyundai meaning. On other makes this number means something else: if your car isn’t a Hyundai, change the make at the top.
Source: tat.net.au (Hyundai manufacturer codes)
The explanation comes from the error code reference in the AvtoElektrik PRO app.