Upstream O2 Sensor Data Issue?
Hi all,
I am hoping I can get some help with my Upstream O2 sensor. It is currently giving me a static reading of about 1 volt. When I rev the engine it drops a bit to ~0.9, spikes up to about 1.4, then levels out back to about 1. From what I know of most cars, this value should be constantly varying when at idle, like a wave sign. History: I've had some issues with my O2 sensors and cat in the past. I replaced my cat not long ago with a Magnaflow, and the downstream O2 sensor wasn't working. So I replaced that and it seems to be working fine now. But I still have that issue above with the Upstream. https://cimg0.ibsrv.net/gimg/www.rx8...b10a984ffc.jpg Idle https://cimg4.ibsrv.net/gimg/www.rx8...de919fbeaa.jpg After rev Do I need to replace the upstream O2 sensor as well? Some other issue? Thanks. |
The wave sign thing applies to a narrow-band sensor which is very imprecise. That's why it oscillates. The RX8 front sensor is a wide-band, it reads the actual AFR and there is no reason for that to oscillate.
1 on that scale is 1 lambda = 14.7 AFR It drops to 0 after revving because no fuel is injected while the engine coasts down. All cars do this. So this is all normal. |
The upstream sensor is a wideband sensor. The current is measured not the voltage
It doesn't work the same way as a narrowband sensor |
Keep an eye on that magnaflow cat, they tend to not live long attached to a rotary. You can monitor cat temperature via OBD if your downstream O2 is in working order.
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That's great news! Thanks a ton guys!
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