Took the '98 into the dealership to try to get warranty covered on it since its got 118,000 miles. Well, didn't get the IP that I wanted, but did get a PMD outta the deal. The code was really the only issue I had that I couldn't solve with cheap parts (next paragraph). I been clearing the code time and time again but it kept coming back. Didn't seem to affect the performance any, but knew it would eventually. I'm just tickled I did get the parts and installation free, even though it just a PMD.
I had couple other codes dealing with boost. Solved one code with the new vacuum lines. Drove it for a while and it would lose boost after 3rd gear (5spd). Finally broke down and bought the Vacuum actuation solenoid and that seemed to fix it. It no longer loses boost. I used to think it was exceeding the IAT threshold, but reading here on the forums I knew it wasn't getting over 200 degrees. Solenoid seem to fix the problem so far. We'll see how the PMD does now.
I had couple other codes dealing with boost. Solved one code with the new vacuum lines. Drove it for a while and it would lose boost after 3rd gear (5spd). Finally broke down and bought the Vacuum actuation solenoid and that seemed to fix it. It no longer loses boost. I used to think it was exceeding the IAT threshold, but reading here on the forums I knew it wasn't getting over 200 degrees. Solenoid seem to fix the problem so far. We'll see how the PMD does now.