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Check engine light on

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Since I put my car back together after the C service I keep getting a CEL when the car has warmed up and I boot it. If I switch off the engine and back on the light goes out. If I drive it normally its fine. The car appears to drive as normal with the CEL light on. When checking the trouble code in Freescan its '13-02 Sensor open circuit'

I tried some switch cleaner on the connector and re connection but seems to make no difference. As far as I can tell its an OEM 02 sensor.

Any thoughts, before I shell out on a new one?

Edited by internets

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