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post #1 of 9 (permalink) Old 09-25-2010, 09:37 AM Thread Starter
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Check engine light - Steps required

Hi all, trying to do some searches on the best way to find this information but came across quite a few links that no longer work. I had my check engine light come on 2 days ago and before I took it into a shop wanted to see if there were any cheaper ways to diagnose the issue. I'm trying to understand if I need to buy an OBDII tester or if I can get the code by just turning my key to ACC/ON? Please keep in mind that I'm about as handy as a shoe when it comes to fixing things so I really need things spelled out in plain English. My 2005 300c has 105k miles so I'm sure that there could be some real reasons for the light to come on. Any suggestions would be appreciated.
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post #2 of 9 (permalink) Old 09-25-2010, 10:59 AM
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I am not sure where you are located, but you can get the code read for free at any Advance Auto or Autozone. Then just google the code for information on how to solve it.
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post #3 of 9 (permalink) Old 09-25-2010, 11:07 AM
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I just posted this on another thread :


"Between the speedo & rev counter in the green led , switch the key on & off three times & you will get a row of dashes come up "---------" then a code if one is present (eg : P0700 ) then dashes then "--done--" will come up when its showed all the codes"


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post #4 of 9 (permalink) Old 09-25-2010, 03:16 PM Thread Starter
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Thanks guys, came up as P0441 which at least on my first google search appears I only need to tighten the gas cap? I'll try a few more searches and also how to reset it.
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post #5 of 9 (permalink) Old 09-26-2010, 08:39 PM
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p0441...look here:

OBD-II Trouble Code: P0441 Evaporative Emission Control System Incorrect Purge Flow

Our cars have a warning specifically for a loose gas cap (at least in 2006 they do) that shows a warning in the EPIC display.
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post #6 of 9 (permalink) Old 10-06-2010, 11:08 PM Thread Starter
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BTW, just wanted to give an update. It did turn out to be just a loose gas cap. After I tightened it the next day the light turned off. Thanks guys for the quick info...definitely saved me some $$$ for some potentially wrong info on things to fix that really didn't need it
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post #7 of 9 (permalink) Old 05-07-2011, 03:21 PM Thread Starter
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so car is now at 115k miles and got a P0521 code. I read the diagnostic which says it's revolving around oil pressure and I'm guessing it can effect the performance of the variable cylinder use. Anyone have any ideas of what steps a regular joe can do to trouble shoot or if this is a must take to the dealership kind of problem? Need to get at least 1 more year out of this ride.
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post #8 of 9 (permalink) Old 05-07-2011, 06:36 PM
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maybe this?

Quote:
Originally Posted by Tbird100636 View Post
I''ll chime in and give my 2 cents worth. Yes, more than likely, it could be a bad pressure sensor. But, let me explain how it works and what else could happen. The pressure switch is not in the traditional sense a pressure switch. It is actually a pressure transducer. You will notice the transducer has a two wire connector that only has one wire going into it while the other hole is empty or has a tube running out of it. The transducer itself is set up for two pins but has one missing. These holes are for air to get into the transducer. It senses oil pressure and compares it to atmospheric pressure (The air that comes in through the empty hole.) and varies the resitance to ground. If the hole is blocked or restricted it can cause the oil light to come on or the gauge to read low and the check engine light to come on. Let's say the holes get filled in by a spider. The transducer cannot compare to atmosphere, since the holes is blocked. Another scenario, dirt can collect in the hole, especially if the connector does not have a tube running out of it. If the transducer starts leaking (Which is usually over time.) this make a dirt mess and again, blocks the hole. The next time it happens, if you are close, go straight to the dealer, and do not shut off the car. This is so you can demonstrate and have proof there is a condition.

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post #9 of 9 (permalink) Old 05-08-2011, 02:09 PM Thread Starter
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Quote:
Originally Posted by Kaiser Bill View Post
maybe this?
thanks, that may be the same issue as the light went off today. I've been getting a parking assist error for a while now....been too lazy to look up how to fix it. Wonder if the sensor needs to be replaced or just a fuse
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