Car warmed up: 0. It does not change. Since this was fishy Next I unplugged the sensor completely. No O2-sensor light illuminates on cluster. The bulb is fine because it illuminates during ignition. It is obvious this has nothing to do with the sensor I spliced in because regardless, if the sensor is disconnected I should get the CE light.
Now I am completely lost on where to go. On a car, the check engine lamp is designed to come on when the computer sees NO O2 sensor activity for 5 minutes after the engine reaches 80C. Shop foreman dealer MB technical information Specialist 15 years E 2. The computer cycles every 10 minutes or so. After replacing O2 sensor the manual calls out for light and heavy use with engine warm for 30 minutes to set the system.
Doc -- You are right on the money. After about 15minutes driving I saw the light come on. OK -- so I have established the ECU recognizes the O2 sensor, now going back to the test procedure: Do you put the DMM inline between the two wires or do you need to measure it using an alligator clip and ground the other side of the DMM? Which is the correct way?
I want to double check my basic tests before going further. I want to make sure that is correct and then we can talk about why from there. I don't understand this at all I grounded the other and monitored it while driving. I am getting I don't get it. Lee over at Fastlane is ordering me the EHA Test Harness so I should have that soon, but in the interim I really want to get my head around having a reading that makes sense from the O2 sensor Last edited by ps2cho; at PM.
Nobody here ever tested their O2 sensor? Chas H. Therefore, in most modern vehicles a car can run just fine without a cat. Please note, this is not to say running without a cat is good for the environment. Gisella Oelkers Teacher. How can you tell if an oxygen sensor is bad? Here are some of the most common signs that your oxygen sensor is bad. A Glowing Check Engine Light. The bright orange Check Engine light in your dashboard will usually glow if you have a bad oxygen sensor. Bad Gas Mileage.
An Engine That Sounds Rough. An Emissions Test Failure. An Older Vehicle. Sandeep Menkhaus Teacher. Are Bank 1 and Bank 2 o2 sensors the same? A typical in-line 4-cylinder engine has only one bank Bank 1. Therefore, in an in-line 4-cylinder engine, the term " Bank 1 , Sensor 1 " simply refers to the front oxygen sensor. A V6 or V8 engine has two banks or two parts of that "V". Naha Bestov Beginner. What does a car do when the oxygen sensor is bad?
If the oxygen sensor is going bad , the fuel-delivery and fuel-combustion systems will be thrown off. If a bad oxygen sensor disrupts the air to fuel ratio mixture, or too much fuel is injected into the engine, your vehicle's gas mileage will be reduced. Anabela Galoganov Beginner. Should I replace all o2 sensors at once? Do I need to replace all of my oxygen sensors at once? It is best to replace your sensors in pairs. For example, if you replace the downstream left sensor , you should also replace the downstream right.
It is probable that on most vehicles, the code will be set within days AFTER the first sensor replacement. Flor Segura Beginner. Is it hard to change o2 sensor? Oxygen sensors are necessary for vehicles to combine the proper ratio of gas and oxygen into fuel. Depending on the make and model, your vehicle could have 2 to 4 of them to replace.
Has it thrown a code yet? Check vacuum lines and intake hoses for cracks and leaks. They're sensitive to leaks. It'll think it's really lean, and dump in a bunch of fuel to compensate. If so, plug in and look at the sensor readings. Could be a number of suspects, this just got me more thinking about how the system would react if one were to disconnect the sensor.
Any stored codes? Turn ignition to the on position, pump gas pedal to wot and release 5 times in quick succession - count the number of times the cel light flashes - will give one long flash followed by blinking. Count the blinks. My e28 would run really rough when it rained hard - shorted out the 02 wires. If you pulled the battery cable for a few minutes it would reset and run fine until the next time it got soaked.
I don't actually run an o2 sensor on the MX6. From what i understand, it could technically be "pre OBD-1," but it does throw a code. OBD1 has no limp home mode. Once it sets the code, and doesn't correct itself, it will go into a default setting. On a number of older cars I've disconnected the O2 sensor, and haven't seen diddly in the way of change in how the engine ran.
That may be a reflection of the state of the O2 sensor in each of those cases.
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