StratfordShark

The CPS is the 944 part in the 87-91 PET for my MY, so I don't know when an alternative part was superceded but no later than MY87

944 606 115 00

Mrmerlin

FWIW the sensors do degrade over time,
the idea that they dont is false.

Here is why, the insulation and the connectors will eventually let in moisture,
this will cause corrosion in the wires.
That will degrade the sensor signal.

The other thing that can damage the sensor is heat, this is difficult to find until,
it becomes a battle to remove a sensor where the engine has overheated,
this deforms the outside of the sensor housing as it melts into the block.

Best bet replace old parts for continued reliability, always use Bosch parts on a 928

worf928

First, what Stan said-^

Next...
This is not good advice in general and particularly not good advice for the CPS, Hall Sensor, and Knock Sensors. Soldering wires is a not-too-hard skill to acquire. Soldering the braided shielding? Not gonna work.

You might have the skill and experience to do what you suggest, but 9999 out of 10000 others that try it will need to buy a new LH harness, or will end up throwing their 928 away.

Kevin in Atlanta

The CPS that appears to have failed is the Bosch 944 variant sold by Roger. It looks to be in perfect shape. The CPS sensor I swapped in while we wait for its new replacement was a shorter version (I replaced the crumbled connector) that I assume is the 928 version.

As for repairing CPS and Hall sensor connectors I have done a few with good results.

I personally replaced the CPS harness connector with a segment of a low mileage CPS harness. I soldered the two coated wires complete with shrink wrap and then used a short segment of coated wire to bridge the two shielded ends.

That being said I do find it hard to believe that a 2 two year old Bosch part failed. Especially since it was ok before we pulled the engine to replace the harness from the CE panel to the distributors that melted. That does still leave open the possibility that my soldering job was suspect and moving the harness around fixed it and had nothing to do with the replacement CPS. I may swap the failed CPS in just for grins and see if the failure is repeatable.

Wisconsin Joe

Don't bet on it.

A long time ago, I had a "no start" on my 944 coming out of winter storage.

After a bunch of trial and error (and not a lot of knowledge or access to internet) I took it to the dealer. Diagnosed as bad CPS, replaced with a genuine Porsche (presumably Bosch).

A couple years later, I started to experience random stalls with no restart. Then the 'no start' reappeared. I started chasing down stuff and eliminating potential areas.

Finally got it down to the CPS. But it was a new one. It couldn't be that. One of the weird symptoms was the connector. If it stalled or wouldn't start, unplugging and replugging the connector would fix it. For a day or so. Maybe. DeOxit, scuffing the contacts, all that would not fix it for more than a day or so. Wiggling the wire without unplugging the connector wouldn't work. Sensor itself tested fine.

I ended up getting really good at hopping out, popping the hood, working the connector, starting the car, closing the hood, hopping back in and driving off. Usually could do it before the light turned green (very common to stall out coming to a stop). Finally changed the harness side of the connector. Worked for a little over a week.

Last winter, finally gave up and got a new sensor. It's started just fine so far this year.

Landseer

Exact same experience here for me, I've written about it and watched as more experienced colleagues kind of expressed alternate theories.

intermittent operation --- changing-out a relatively new CPS (Bosch made, though now in China) has been my culprit several times on 928 and 951.

My cases would of course be better if I could show the wave form pattern... but empirically, CPS is always an early suspect for me on cars that use them. Similar to what Joe just noted above.

Fantastic that you've fixed it.

outbackgeorgia

I don't disagree, but what works for me may not be the best solution for everyone. If I Needed a new sensor, I would still solder it in to eliminate the connector. Part of that process is to assure the wires are bright and clean. Plenty of wire.
Notice my avitar, bad cps connector. Lesson learned.
Dave