A recent Blue Print ProTip, looks at problems that can occur with some Hyundai i10 and Kia Picanto Oxygen sensors.

Problem
The engine is running unevenly, fuel consumption has increased and the ‘check engine’ warning lamp is illuminated.

Fault code P0141 - O2 sensor heater circuit (bank 1, sensor 2) malfunction is stored in the engine control unit (ECU).

The fault re-appears after a new oxygen sensor has been fitted.

Cause
The wiring harness that is connected from the oxygen sensor to the ECU has a high electrical resistance value, causing the issues listed above.

Solution
Before replacing the oxygen sensor, a test of the wiring harness that connects the oxygen sensor to the ECU should be completed. This is due to an intermittent out-of-tolerance electrical resistance reading, causing the P0141 fault code. If the fault is detected in the wiring harness, either a replacement harness will be required, or a repair on the existing harness will have to be carried out.

When the necessary work has been completed, clear the fault code from the ECU using a suitable diagnostic tester and perform a road test.

For more technical information please visit: partsfinder.bilsteingroup.com.