Check engine light on

Except the cat. converter, I just replaced the converter a few months ago, what else can cause the check engine light on again?

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大漢民族 提到:

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TWO HUNDRED things can turn the MIL on. Get the code read. It consists of a letter and four numbers. (e.g.: P0300, P0402, P1457, etc)
AutoZone or PartSource will do it for free. Report back here.
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Probably O2 Sensor - likely heated it up when the converter was replaced. Just a guess though. Find a place to do OBDII and get the code. MZ
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大漢民族 wrote:

Hundreds of things can turn the light on. You need to read out the error codes to make progress.
John
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大漢民族 提到:

Thanks to all gurus To get a code reading is not that easy, some place charge $50 just for reading, some place like Advanced Auto Parts, it says "Free code reading for customers", when you actually went to the store and require a help, you would find nobody willing to help you. So I let my mechanic fix it, it was EGR problem, so he replaced the EGR system for a total of $180. I am thinking about buying a code reader device, or is there any device that can connect to PC and get the code out? I think the code reader is becoming a popular and necessary device to average people.
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You can buy an OBC II reader for just over $100. Also, get the manuals my 1999 RL has set intermittent codes before. I have saved enough to pay for the reader and the manuals many time over.
大漢民族 提到:

Thanks to all gurus To get a code reading is not that easy, some place charge $50 just for reading, some place like Advanced Auto Parts, it says "Free code reading for customers", when you actually went to the store and require a help, you would find nobody willing to help you. So I let my mechanic fix it, it was EGR problem, so he replaced the EGR system for a total of $180. I am thinking about buying a code reader device, or is there any device that can connect to PC and get the code out? I think the code reader is becoming a popular and necessary device to average people.
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