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Can an exhaust leak trigger the Service Engine Soon light?

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Old 02-06-2011, 12:38 PM   #1
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Can an exhaust leak trigger the Service Engine Soon light?

My engine light came on today...

I'm up to date with maintenance on her and I don't really know what the problem could be.

I have a pretty bad leak in the Flex Pipe and haven't got around to getting it fixed yet, could it be that the leak got bad enough to illuminate the light?
I'm going tmr to have my mechanic run the code but trying to figure out what may be wrong.
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Old 02-06-2011, 01:20 PM   #2
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Step 1. Read codes.
Step 2. Listen to your mechanic.
Step 3. Research what you need to know.
Step 4. Fixed.

You jumped right to Step 3. Take a deep breath, and wait it out until tomorrow.
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Old 02-06-2011, 02:46 PM   #3
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Quote:
Originally Posted by michaelm815 View Post
My engine light came on today...

I'm up to date with maintenance on her and I don't really know what the problem could be.

I have a pretty bad leak in the Flex Pipe and haven't got around to getting it fixed yet, could it be that the leak got bad enough to illuminate the light?
I'm going tmr to have my mechanic run the code but trying to figure out what may be wrong.
Possibly. I know my test pipes are not snuggly fitted and there is a leak which i need to retighten soon and my check engine light has been coming on pretty often the past few months.
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Old 02-06-2011, 05:05 PM   #4
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yes it can
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Old 02-06-2011, 05:21 PM   #5
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get cheap code reader on ebay. comes in handy more than you think.
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Old 02-06-2011, 05:38 PM   #6
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^Otherwise Autozone= free code check
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Old 02-07-2011, 05:43 AM   #7
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Originally Posted by zzmmrx0xmzz View Post
Possibly. I know my test pipes are not snuggly fitted and there is a leak which i need to retighten soon and my check engine light has been coming on pretty often the past few months.

test pipes usually set off the rear o2 sensor because the readings are different.

But yes an exhaust leak CAN cause a cel. It is EXTREMELY RARE it has to be a massive leak at the right spot.
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Old 04-27-2011, 09:55 AM   #8
 
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i have a check engine light for the rear o2 sensor wich i changed but keeps coming back on after reseting it. i have a massive leak in the flex pipe which is getting repair right now should get it back in an hour ill see if the light goes away.
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Old 04-27-2011, 12:38 PM   #9
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Quote:
Originally Posted by chico102388 View Post
i have a check engine light for the rear o2 sensor wich i changed but keeps coming back on after reseting it. i have a massive leak in the flex pipe which is getting repair right now should get it back in an hour ill see if the light goes away.
Think about it now - o2 sensor is a Oxygen sensor, it is looking for changes, from a preset value, in the oxygen in the exhaust. You have a "massive leak" ahead of the OXYGEN sensor

Last edited by MerlotMax; 04-27-2011 at 03:55 PM.
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Old 05-04-2011, 07:05 PM   #10
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if the leak is before the o2 sensor then yes.
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