Rough idle and codes P0303, P0305, P0300, P0030, P0036, P0501, P0136, and P0304

I don't have a live data scan tool. I'm afraid that's above my level of knowledge or comfort. I should also mention that the car is running hot. I tried to drive an 18-minute commute yesterday and it was past the hot zone in 6 minutes.

Hi Joe. It's been a while since I've written back because I've been trying to get help in my neighborhood, but everyone is too busy to follow-up what they started.

I have checked the ignition coils for cylinder banks and they all appear to be okay. The ignition coils actually look new. I did notice a bad spark plug or two, and the intake hose has a hole in it.

I have included pictures for you, if they will attach without fail. A buddy helped yesterday by pulling up the plenum to get to the back spark plugs. When we re-assembled everything and cranked the engine there was a dull pop that came from it.

My friend noticed that the back of the plenum was too loose, meaning I have to start this all over again. My friend won't be around for a few days I'm sure.

Also, last week I noticed a box hanging almost to the ground. It has rusted out of its housing. It appears to be a charcoal or evap canister. It is attached from some tubes toward its center, but its side has appears to have some tubing missing that is going up towards the gas cap. I smell gas fumes. I really need some help with this car.

It most certainly is rust. Have a look at this pic showing my attempt to support it with a plastic grocery bag. As I was handling the canister the housing all around it was steadily crumbling on my face.

That bag has been removed. If you will notice the first pic, I have it held up by shoe strings. I have changed all spark plugs and am replacing the intake hose tomorrow. After that, I'm thinking perhaps I should sell this vehicle, or trade it in.

Here is a video showing the underside of the vehicle from the rear end.

No, it isn't. I have a video of that too if you need to see it. I have a neighbor who helped me install new spark plugs, and replace the air intake hose. He had me crank up the car and it sounds a bit different but still rough. He thinks it's the O2 sensor or a clogged catalytic converter? I'm replacing the plenum gasket and have ordered new spark plug wires. They arrive on Monday. Is there anything I could be doing in the meantime? My neighbor that helps me is a bit impatient, and gets cranky. I'd rather do this myself. Working with you is a lot more comfortable for me. I appreciate your time and effort! Todd

Joe, I owe you an apology. The OBDII codes that I'm overlooking direct me right to where I need to focus! P0136 already tells me that's it's an O2 sensor (bank 1, sensor 2), but I just can't find the darn thing. I learned where it should be and that it's downstream but I swear I took a carp and hunted all under this vehicle and cannot find it. There appears to be a hole near the side of the catalytic converter but I can't be too sure. And that whole rusted corner where the charcoal canister is hanging really bothers me.

The JVC radio in this car is awesome though! Can it be removed if I get rid of the car?

I'm very close to parting with this car. I'm a Saab enthusiast and I have the opportunity to buy another one off a dude for $1,50.000. (I've owned 7) It needs power steering pump replacement and has no radio. I was going to offer him $1,200.00.

Check out this item on OfferUp. https://offerup.co/4NAdaiAATgb

Thank you for the attachments you provided. I thought the first one was B1S1 since it was before the catalytic converter, on the firewall side and higher up. I recognized the location of B1S2 better in the second attachment. I misspoke about the hole in the catalytic converter. That was a mistake.

What I did find is the location of all the O2 sensors and I learned a lot about this engine by being underneath the car for 45 minutes. There appears to be an oil leak around the sensor that I was searching for. I attached two pics (one with natural light, one with flash) and if the video will transmit, it will be provided as well. I also saw some droplet of green substance, perhaps coolant.

Perhaps the green I saw is dry, even better. And the oil just seeps, it's no leak onto pavements. I should've put some spray to loosen the rusted bolts while I was under there. I really wanted you to see the video. It's like a fascinating whole, new world underneath there, lol. Because there is little wiggle room and that sensor is not budging, I will take to a shop where the lifts come in handy. I also dropped my 12mm socket down in the engine. I have to fish out!

Joe, you've been wonderful and helped me narrow down to the culprit, something no YouTube video did clearly. I thank you!

Man, the socket is just underneath the plenum. I can see it right there. It is between the manifolds. And dude, check this out. I go out this morning with a brilliant idea to attach a clip-on refrigerator magnet to the handle of a feather duster. Guess what's now there with the 12mm socket? Yep, the clip-on refrigerator magnet. I then went in my tool kit to find a flat head screwdriver long enough, then thought "let me quit while I'm ahead". The magnet is so strong that it's clinging to the alloy on the engine, lol.

I have a mobile mechanic coming tomorrow who happens to have done a job for another client on the same car. He than bought said car off the client. I gave him my budget, got his credentials and references and plan on meeting him tomorrow. He'll allow me to do some of the work myself and save.

Can I ask what don't you know? In case other projects come up like car audio, fog light repair (one doesn't work). I'm thrilled to be giving this free car another chance. It is loaded with accessories that all work!