Resolution! Thanks firstv70volvo and SuperHerman for your suggestions and help. All issues are resolved.

The ECM-600B Turbocharger (TC) control valve – signal missing was the result of one of the harness wires at the plug for the TCV valve was disintegrated and the other wire had multiple breaks in ...

Update: i installed a new TCV and hooked up the battery. I ran the scan again. Oddly enough one of the O2 sensor codes disappeared:

Disappeared: ECM-221B Rear O2 sensor aging, bank 1 – signal missing
Present: ECM-222B Rear heated O2 sensor (ho2s), bank 1 – signal missing
Present: ECM-600B ...

I have also read that having a crack in the tube between the air filter box and turbo can produce erratic symptoms in the turbo. I just hope its not a short in the wires somewhere. I just hate running down electrical shorts!

Thanks for the suggestion. I just checked all of the fuses under the hood and all of the fuses at the left of the dash inside the cabin. All good. Also, today I pulled the ECM and all of the connections looked good/uncorroded. I sprayed contact cleaner on the receptacles and moved the ECM in and out ...

The symptoms began with a check engine light showing large evap leak. I put off the repair because I read that the evap canister is in the most inconvenient place on the car, right by the fuel tank above the rear axle.

After a long trip recently, the rear hatch handle that signals the hatch light ...

Thanks for all of the responses and help. It looks like only the top PCV hose was replaced at 100,000 miles. Yikes! Behren’s in Easton, MD is changing hands as the old owner has retired. I found a shop near Salisbury with a Volvo trained mechanic on staff. It has a bunch of great online reviews. I ...

It looks as though I have a partially clogged PCV system that caused the rear main seal to start leaking at 189,000 miles. I had the major timing belt service done at 105,000 miles and my former mechanic in Ohio indicated that the PCV looked good. Now I'm thinking that if that was the case, my rear ...

Hi everybody. I removed the connector to the TB and sprayed plug with Electronic Contact Cleaner and plugged back in. I then put ignition in ON position and read existing 1167 and 2135 codes and cleared them, shut off car and then started. No codes, no issues. Multiple miles and start sequences over ...

Thanks. I'll give that a try!

Wow, just wow... Last year with throttle body codes I replaced TB with a new Bosch unit. Car has run fine until this morning. Reduced Engine performance light on. Code p2111. Cleared the code took 3 times and engine ran fine. drove, shut off, fine. Third time light on again, now with codes p1167 and ...