michaelm815

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.

Rochester

iTrader: (3)

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.

zzmmrx0xmzz

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.

Stormzusmc

iTrader: (17)

yes it can

captain jack

get cheap code reader on ebay. comes in handy more than you think.

Nexus67

iTrader: (23)

^Otherwise Autozone= free code check

ken85

iTrader: (1)

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.

chico102388

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.

MerlotMax

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

bmwmike

if the leak is before the o2 sensor then yes.