Here's what I'm thinking:
My P0133 (downstream 02 sensor) which flashes on about once every hundred miles and my new P0140 (which has flashed on once before about a thousand miles ago), they both refer to faults occurring with the 02 sensors. I get that. My question is, what is the likelihood that this is being caused by leaks, either at my exhaust manifold or at the flex pipe? Here are pictures I posted on a previous post about looking under your car and being scared by what you see! I can't believe these would hold anything. And you can "smell" exhaust when you turn the car on and idle too long.
How would you guys handle this?
This piece from FCP for $149 https://www.fcpeuro.com/products/volvo- ... 70-9471934. It doesn't look "too impossible" (I was able to remove a broken exhaust manifold bolt off my Saab, and that one was stuck behind the turbo inlet... But man, you break something here and it's going to be a pain!). I'm thinking the $150. Plus about $150-250 for a new cat and muffler weld at a local shop.
Or should I just get a shop weld on a flex pipe, aftermarket cat and muffler on and roll the dice? I'm sure I could get that done around here for $200... Which is close to the price of two new 02 sensors...
My question is, if they're sawing away at that flex pipe, is the likelihood that they'll knock that exhaust manifold loose a real possibility? Just trying to get a handle of how to approach tackling this.
Really taken aback by the drop in gas mileage lately. I think we're at something like 16mpg...
As always, many thanks for your input everyone!
