Have a 2000 e320 for about a month today the check engin light came on i have 45 k miles

You need to connect a scanner and check for codes. There will certainly be at least one.

Yeah. no point in thowing parts at it untill you determine what set the light off. if it still runs good, it could be an air mass sensor, o2 sensor, or air injection system fault.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

If you have a local Harbor Freight Tools you can pick up an inexpensive scanner. Many people on these forums get OBD II /CAN model. It normally sells for $59 in the store but if you bring in a copy of their online ad ($39) most stores will give you the lower price. The model is 94169.

Plugs in under dash next to hood release. Flip down a small cover first. Easy to use. If the post the codes you receive with it, many people here will be able to give you a pretty good idea of what the problem is. Even if you don't intend to DIY you will be more knowledgeable when dealing with the independent or dealer.

You can go to Auto Zone and they'll read codes for you for free.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

those are great littlle scanners, and if your going to keep that car for any lenth of time, they are worth having.

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1993 300E
1999 E320 Estate

Thanks RichardM98, you saved me $20. The store sale price was $59 since I brought a copy of the add they honored it. Normally the online sale items ring up at the sale price in the stores but not for the scanner.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles