Question about Schiller Welch Allyn Cardiovit At 2 Interpretive Ekg Machine

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2001 audi a4 CEL came on

Hello i have a problem with my 2001 audi a4 1.8t quattro ...my engine check light came on flashing and the car run really rough and engine shaking like 1 of the cylinder is misfiring,,,the strange part is sometime it stays on steady and the car runs fine...very strange i had 3 coils change but 1 i havent change yet. could that last coil i havent change causing this problem ,,,i borrow obd2 from friend had code reading a misfire on cylinder #4 ,o2 sensor,ignition module and thermostat sensor ....so which of this is causing the misfire or CEL coming on.. i do not want to go to the dealer to fix .dealer will clean me dry...please i need some advised on what i should do.

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Flashing CEL with rough idle indicates a misfire. Most commonly, this is due to a coil going bad. First, erase the codes and try swapping the suspected bad coil with a good coil in another cylinder to see if the misfire (and code) follow the suspected bad coil. If yes, replace the suspected coil. The other codes are likely other problems. I believe that the 1.8t had issues with bad coolant temperature sensors, so that might cause some of the other codes and/or the stalling.

Posted on Jun 25, 2009

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SOURCE: 2001 audi a4 1.8t CEL came on

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Posted on Sep 05, 2010

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2001 audi a4 CEL came on


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2 Answers

2001 audi a4 1.8t CEL came on


Thanks for your question!
I'm sorry that you haven't received an answer yet.
The response rate on FixYa FREE questions is usually over 80%, but sometimes questions go un-answered when:
1. the question is unclear, incomplete, or poorly worded...
2. the question is mis-categorized - so the correct experts aren't viewing it...
3. the question requires an answer for something that cannot be explained online adequately...
4. specific training, tools, or equipment are required to avoid injury or death...
5. the Experts that are online simply don't have the resources to answer your question fully...
Please feel free to re-work your question if you feel one of these may be the reason.
Of course you are not required - but converting your question to a PAID one usually increases the reply rate as well.
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Sometimes FixYa will run specials for unlimited questions via monthly subscription or reduced rates for limited periods.


Consider the savings that can be had when an informed Expert can save you a $100 service call, or a $350 trip to the car dealership.
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May 19, 2009 | Schiller Welch Allyn Cardiovit At 2...

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Here is a manual, but you have to purchase it:

http://shopping.msn.com/prices/audi-a4-service-manual-1-8l-turbo-2-8l-including-avant-and-quattro/itemid2373553/?itemtext=itemname:audi-a4-service-manual-1-8l-turbo-2-8l-including-avant-and-quattro

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