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Hello and thank you for your question,What size engine are you working on?
The most common cause for the code 41 to set is in most cases caused by a failing O2 sensor providing you have good fuel pressure and no engine vacuum leaks, before you consider replacing it take a look in and around the intake area to make sure there are no loose and or broken vacuum lines. If no vacuum leaks are found and you have good fuel pressure (32 to 45 PSI) then I would go ahead and replace the O2 sensor.
how you check fuel pressure
To check the fuel pressure you would need to install a fuel pressure gauge to the fuel rail service port located on the injector rail and monitor the pressure with the engine running. If you are not feeling any loss of power its likely going to check okay.
were is sensor its easy to change right?
The sensor is located in the exhaust pipe a few inches down from where it connects to the exhaust manifold. Its not to bad to change as well.
in most cases is that the issue. and does that cause what I was saying earlier jolt when let off gas and not to good execration
A bad O2 sensor will not usually cause any symptoms. The jolt your feeling is not likely related. One other thing you can check is to try cleaning the MAF (mass air flow sensor) located on the air filter housing with some MAF cleaner you can pick up at any parts store. If its dirty it can cause this type of jolt your describing.