Everyone with a 560 SEL PLEASE respond ! ! ! My 1988 560 SEL
doesn't have a warning light in Dash Console even though MB
CD says it has light . The light should be red lensed and have
space next to SRS (with other words :#1 starting from right to left ) .I don't have this light and when I took out Dash console there was wire with bulb and when I looked through the hole for warning light there is just red lens with nothing
written on it !!! Now , how do I know if O2 sensor is bad ?