Quote:
Originally Posted by 240sxTuck
TBH, the O2 sensor won't tell you much unless you're looking at a oscilloscope. Gotta see it in the graph to really get a decent understanding of what's going on, otherwise it's just a bunch of meaningless flashes on the dash
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The information in the full service manual will show you how to put the car into a diagnostics mode which flashes 2 LEDs on the ECU depending on it running 5%+ rich or lean, or within spec. Just using the dash light won't get you anywhere