94 540ia check engine light came on

I don't think that your problem is "fixed". You need to do what is called a "stomp test":

down the codes (like morse code) here is a snipet of detailed instructions: First of all, there are more than just 13 fault codes there are 56. Perform the "Stomp test"; here is how to perform the stomp test and how to read the code. Turn the ignition key to on but do not start the engine. Quickly, fully depress and release the gas pedal five times within five seconds. Flash codes- Upon successfully stomping, the check engine light will begin to flash a series of digits. For example, Flash pause Flash Flash Flash pause Flash Flash pause flash would be code 1321. the pattern will then repeat, I'm not sure how many times though. Once you have your code, look it up in the Bentley manual (Bentley also covers this procedure on page 100-9.) If you do not have a Bentley, post your code and I will look it up in my Bentley. ...end of snipet

Go to

for the search feature > hello,