exhaust leak

jtwerp · Post by **jtwerp** » 19 Oct 2011, 17:23

would an exhaust leak cause the CEL to light up?

Dave Swann · Post by **Dave Swann** » 19 Oct 2011, 17:27

Yes, it would. Look for a leak upstream of the O2 sensor.

Post by **Ozark Lee** » 19 Oct 2011, 17:29

It can, it depends on where it is leaking. In front of the catalytic converter yes, behind the catalytic converter, usually not.

Have you had the codes read?

...Lee

FCPEURO · Post by **FCPEURO** » 19 Oct 2011, 19:14

Definitely have the codes read. It may be something completely unrelated.

jtwerp · Post by **jtwerp** » 21 Oct 2011, 10:23

got codes from car,
A2: 436 and 435 (slow response from O2 sensors)
A3: 424 and 142 (the cyclops brake light is out)
B3: 122 not sure about this one????

jtwerp · Post by **jtwerp** » 21 Oct 2011, 10:40

sorry, forgot to mention the leak is the pipe that comes out of the catalytic converter, if i push up on the pipe the leak stops but comes back when released

Post by **jblackburn** » 21 Oct 2011, 10:48

Post up a picture if you can. If you need help, shoot me an email with the picture and I'll attach it for you.

You can probably fix this with either an exhaust clamp or by having it welded at a shop.

Post by **Choguy03** » 21 Oct 2011, 11:30

I agree. I'm guessing it it from the flex pipe coming from the rear of the cat.

Post by **cn90** » 21 Oct 2011, 15:34

Classic problems:

1. REAR of cat where it meets the Front of Muffler: have a muffler shop weld it, about $50-60.

2. REAR of Exhaust Manifold is the Flex Pipe where it meets the Front of the Cat: for this search forum for:
- OBX (thread by Ozark Lee)
- Volvo OEM Exhaust Manifold, I posted a DIY recently, search for it.

Post by **erikv11** » 21 Oct 2011, 17:50

Since the OP just posted that the leak is right behind the cat, you are both probably correct

OP: here is an example from a couple days ago, where someone fixed this problem
https://www.matthewsvolvosite.com/forums ... 6&p=211457

EDIT: and to answer your original question: NO, an exhaust leak back there will not cause a CEL to light up.