Maximizing Sensor Performance A Guide to Normal Readings

O2 sensors should be between 400-700 mV, however that also depends on how rich/lean you are running. At idle, the MAF should read <2 lb/min. The wave form looks normal. It is averaging the fuel mix, and not stuck rich or lean. Did you install aftermarket cat, possibly a higher restriction. Second, normal readings at sea level are 8-12". At higher altitudes, expect 14-18". Before you buy a new part, check for vacuum leaks. An ... Notice things like MAP, MAF, ECT, IAT, and even HO2S (Oxygen Sensor). The MAP should read between 95-105 in most cases, your MAF should read ... All sensors measure about 10-ohms cold, and about 16.5-ohms hot. -Voltage readings were taken after car was running (idle) for about 20 minutes. When I often see a more or less constant reading on those tools, I expect the DME to be upset, yet it often isn't. I expect to see readings ... Hey I was just wondering what normal voltage should be for o2 sensors mine seem a bit low. Downstreams tend to hang below .4v usually around ... When I was graphing the front O2 sensor the voltage readings were steady around 18000. ... Was car already at/past normal operating temp (ramp-up)?. When the air/fuel ratio is perfect and the fuel mixture is 14.7:1 (stoichiometric), the sensor will generate approximately 0.45 volts. This is ... It will read very rich almost all the time in around the 0.845v range give or take a little but then if you just let it sit it will drop down to 0.1v or below ...