Decoding Normal Sensor Readings A Practical Guide

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. 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 ... the traditional B1 S2 sensor. The rear sensor, S2, reports voltage in the manner you described. The front sensor, S1, can report in several ... 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 ... If the upstream O2 sensor voltages appear normal (cycling) and the downstream voltage is tracking the upstream O2 voltage then your cat is bad. One which is pre-cat was about 1.5 (up to 2) volts on idle. I've been told that lambda probes should not give more than 1 volt, so I've decided ... ... sensors are coming back up to what I would think to be more normal. Short term fuel trim is still sitting at around -32 on both banks. Save 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 ... The normal readings are 18 to 19 in. There must be some issue with the source vacuum or a voltage drop to the required circuits for that sensor to work. Problems/Service/Repairs - are these normal MAF and MAP sensor readings? - - 2007 LS - 2.2 liter EcoTec engine - about ~98k miles - auto ...