How are sensor data used in the ECU?
While this is going on, the oxygen sensor takes readings from the exhaust gases to determine how much fuel to add with the fuel injectors into the combustion chamber. The ECU uses the camshaft and crankshaft position sensors to determine where the pistons and valves in the engine are at any given time.
Why is my oxygen sensor showing bad readings?
Most mechanics will often say it’s the o2 that is shot when it is actually the cat. When the cat is restricted, the downstream o2 will show bad readings. Understanding downstream and upstream, LTFT (long term fuel trim and STFT (short term fuel trim) live data is something that A LOT of techs don’t understand.
When do you need to replace your oxygen sensor?
Oxygen sensors eventually need to be replaced in all vehicles. If your vehicle’s O2 sensor is faulty, chances are there will be signs! Check this list to see if it’s time to replace YOUR vehicle’s oxygen sensors:
Why does my O2 sensor Say my Cat is clogged?
If it reads hotter behind the cat than it does in front of the cat, then the cat is clogged. The downstream o2 sensor’s job is to monitor the catalytic converter. Most mechanics will often say it’s the o2 that is shot when it is actually the cat. When the cat is restricted, the downstream o2 will show bad readings.
When to reset the ECU after changing an O2 sensor?
Sometimes an O2 sensor fails, and you need to replace it. Once you’ve replaced your vehicle’s O2 sensor, you’ll need to reset the ECU so it can properly gather information from the new O2 sensor.
What happens if your oxygen sensor is too worn out?
Finally, if the oxygen sensor is too worn out; it will lag in response time or can just stop working altogether. Silicone and Sealant ( Not Sensor Approved ) So, over time, your (O2) sensor can become; caked with byproducts of combustion like sulfur, lead, fuel additives, and oil ash.
How does the ECM know the location of the crankshaft?
It is responsible for telling the ECM the exact location of the crankshaft as well as the RPM (rotations per minute) of the engine. With this information the ECM knows the position of each piston in each cylinder. Using the cam sensor readings, as well as the crank sensor readings, the ECM knows exactly which injector needs to be activated.
Where is the O2 oxygen sensor in the engine?
Also, The (O2) Oxygen Sensor is not able to measure the air or the fuel entering the engine. Because, the (O2) Oxygen Sensor is located in the exhaust and that where it reads the actual oxygen content in the exhaust. Depending on the year; make and model of your vehicle you could have anywhere from one to four (O2) Oxygen Sensors.