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Rockingruvin

Rockin ... 1/4/2020

2001 Kia Sportage Base 4 Cyl 2.00L

Engine

Downstream O2 sensor drops to 0 volts


A recently replaced downstream O2 sensor is throwing a code of low voltage. Using live data, the voltage starts around .4v for about two minutes, then drops to 0

1 Answer


Jimm

Jimm 1/12/2020

An O2 sensor low voltage may be caused by several issues;

Faulty O2 sensor
Exhaust leak near the rear sensor
Plugged catalyst
Short to voltage on O2 signal circuit
High resistance or open on O2 signal circuit
Engine running very rich or lean
Engine misfire condition
Fuel pressure very high or low - fuel pump or pressure regulator

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