I'm not understanding the code of 20, your 1997 Saturn has an OBDII computer. you need a code reader to get engine codes. you cannot pull codes manually by shorting terminals A-B anymore. every one of your engine codes is atleast 3 digits, and should start with P. for example: a faulty oxygen sensor with no responce will show a code of P0134, or a EGR with insufficient flow will show a code of P0401.
My code book shows that an OBDII code of P0020 is a camsharft position actuator circuit bank 2. you have a sensor problem or your cam chain has stretched beyond the tensioner's ability to remove slack. I was getting camshaft position errors and had to replace the cam chain and tensioner.
Problems with the oxygen sensors are quite likely to cause emissions test problems. The car computer cannot properly adjust the air/fuel mixture to regulate the emissions.
Varies, a couple of weeks should be enough.
They are replaced when they go bad.
A 49 state emission engine has 2 sensors, a California state emissions systems has 4 sensors.
I can assure you that the O2 sensors will not prevent the enigne from starting, even if they are disconnected or removed. Something else is the culprit.
As far as I know there is 2 02 sensors if you look into the wheel well with the tires turned you can see them just to the back of the manifolds. They should be pointing straight up. I just replaced the o2 sensors in my 98 and there was 2. It may depend on if you have standard or CA/MA emissions. My truck has one with standard emissions. The same truck in CA or MA has two. 95 f150 5.8
That depends on the engine. I have a 99 GC with the 4.0 and there are two O2 sensors. 4.7L has 4 4.0 federal emissions has 2 4.0 California emissions has 4
No you cannot, It is controled by the computor-- Emissions sensors. What emission sensors,where would they be located?
If the oxygen sensors for the 1991 Chevy 4.3 is running rich when it is warmed up it is best to have the sensors replaced. Once the sensors are replaced this should resolve the issue.
Most 4.0L engines with federal emissions have two oxygen sensors located on the exhaust pipe before the muffler. One sensor is mounted before the catalyst (upstream) and one is mounted after the catalyst (downstream). Most 4.0L engines with California emissions have four oxygen sensors. These are mounted in the exhaust manifold area. Two are upstream and two are downstream. There is an emissions label under the hood of the vehicle that identifies the emissions type.
All sensors, air pump, and EGR
There are about 7 sensors on the engine that are to reduce emissions.
Have you had your 4 oxygen sensors replaced? It turns out when they replaced my oxygen sensors, they were after market parts so the service engine light did not come and gave codes even though they were replaced.
There are 3 oxygen sensors on this vehicle. Some of the Highlanders with California emissions have 2 fron Air/Fuel Ratio sensors and one rear Oxygen sensor.
California emissions= 4. All other states= 2.
Ca has 4 oxygen sensors,other 49 states have 2
It will have two or four depending on the emissions package.
No, they will need replaced if defective.
Oxygen sensors on a 1989 Toyota SR5 and located near the catalytic converter. The sensors read the emissions from the vehicle so the ECU knows ho much fuel to run in the engine.
2 or 4, it depends on the emissions package.
Go to Rockauto.com , put in your vehicle info, click on left Emissions and then O2 sensors and you will see picture of sensors for your truck.
As far as I know they can not be cleaned. Must be replaced.
Depending on the emissions package there will be either 2 or 4.
The ECM (Engine Control Module) controls the exhaust emissions with information it receives from various sensors.
The oxygen sensors control the amount fuel in the engine and if it is making too many emissions the oxygen sensors will cut back on the fuel or if they are worn out they will increase the amount of fuel. The catalytic converter will eventually get plugged up if the Oxygen sensors are bad. The oxygen sensors control the converter.