P0430 Code - 2001 Boxster

[blue62]

Originally Posted by Tweetdriver63

My 2001 has two codes that show whenever the CEL comes on. It was this way when I bought it, and the previous owner said it was something that started happening after he had an issue with the AOS. Note: I replaced the AOS last year to cure some white smoke that sometimes showed up when first starting up after sitting a while.

Anyway, just as the previous owner had told me, that CEL would come on every now and then, but not frequently. I would go months without it showing back up after I cleared it with my Durametric. Lately it's coming on every couple of days.

The two codes are the P0430 and P0197 (oil temperature sensor below specified value).

These codes never show up separately. Every time the CEL comes on, I get both codes, and always the same two.

I've read a lot of threads now, and I'm not sure where to go from here.
What values should I look at in the Durametric to help diagnose these problems?

your P0197 code is listed as a short to ground

Going with simplest things first diagnostic principals I would try to find out why the oil temp sensor is throwing a code.
It could be a wiring issue some where between the DME and the oil sensor.
It could be a faulty connection in that wiring.
It could be the oil sensor its self.

Point is find and fix the oil senor issue first. It should be simpler, easier and cheaper.
Once that is fixed it could fix the P0430 code as well.

These are just my thoughts and guess's on the issue

[Tweetdriver63]

Originally Posted by blue62

your P0197 code is listed as a short to ground/ lean mixture threshold.
I interpret that as an issue that is seen by the oil temp sensor which in turn tells the DME that the fuel air mixture needs to be leaned out. It has reached it's full lean limit and thus set the code. This in turn affects o2 sensor readings. which in turn could be the cause of the P0430 code.

Going with simplest things first diagnostic principals I would try to find out why the oil temp sensor is throwing a code.
It could be a wiring issue some where between the DME and the oil sensor.
It could be a faulty connection in that wiring.
It could be the oil sensor its self.

Point is find and fix the oil senor issue first. It should be simpler, easier and cheaper.
Once that is fixed it could fix the P0430 code as well.

These are just my thoughts and guess's on the issue

Thanks for the reply. I will start with replacing the oil temp sensor and see what happens.

[blue62]

I would make sure the wiring to and from the sensor is not the problem before replacing the sensor. The P0197 code is for a short to ground on that oil temp sensor. Could be as simple as a bare wire touching metal.