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YOUR RESEARCHP0343, woe is me
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Replace later crankshaft sensor went, giving same symptoms, intermittent firing
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I'd say Sensor has deteriorated and is wicking oil back to wiring connector head, I had similar on my MB, II went ahead and replaced , Later Crankshaft Sensor went, giving same symptoms, intermittent firing after warmed up.
Leading evidence: 'Replace later crankshaft sensor went, giving same symptoms, intermittent firing' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check wiring of the sensor' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
You may want to use contact cleaner to clean the electrical socket thoroughly before plugging it to the new sensor.
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Suggestion
But figured since the car is 20, probably can't hurt to replace the sensor.
Replace later crankshaft sensor went, giving same symptoms, intermittent firing
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
I'd say Sensor has deteriorated and is wicking oil back to wiring connector head, I had similar on my MB, II went ahead and replaced , Later Crankshaft Sensor went, giving same symptoms, intermittent firing after warmed up.
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Rennlist: 1 discussions
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2003 996, 2wd, man trans
here's the run-down, symptoms:
when fully warmed-up, driving at 2800-ish RPM at light throttle, there is an intermittent surge or jerk, best described as a 'hiccup' felt
very intermittent hard starting (crank, no start) after a short hot soak, starts on 2nd or 3rd try. Has stalled two or three times at idle, soon after coming off of a long freeway run (but not immediately after)
has thrown P0343 code a couple of times, after experiencing the 'hiccup' for an extended period (long freeway drive, smooth road), freeze frame data always shows it at 2840RPM
one time also recorded misfire codes on the opposite bank at the same time as the P0343
check engine light does not stay on
The camshaft position sensor for bank 1 seems pretty well hidden, but at least I could see there were no signs of rodent activity in the engine bay
There is a bracket that holds on the sensor that is a known failure point. it can crack and vibrate. Sounds like it with the intermittent failure.
Might want to get cam deviation checked to be sure nothing more going on.
Do you have service history?
So is the sensor located at the "front" of the engine (rear of the vehicle)?
When I try to look it up, I find varying descriptions.
If I'm getting a cam position sensor fault, will my deviation readings be accurate?
Yes, it's the black connector to the right of the green cam plug. I think the DME is smart enough to detect a short and ignore the bad readings. Do you have odd cam deviation readings?
I suspect your bank 1 cam sensor is acting up or there's an intermittent short in the wiring. The cam sensor wires go from that connector in the pic to the X59 connector, then to the DME. Not sure why it always happen at the same rpm though.
I'm hoping for it to be the sensor only. Considering how it only acts up when really warmed-up, and driving on a smooth surface...
You'd think if there was a broken wire or connector then rough roads would be a factor.
I was finally able to spend a little time poking around. With the airbox out, I could see the sensor and connector on the driver's side cylinder head. I was able to unplug the connector, and it was "wet" inside. With what, I cannot tell. Next I want to remove the sensor, but haven't figured out how to get a wrench to the allen head bolt holding it in. It seems as if I'll need to support the engine and remove the carrier plate to gain access.
OK, with the help of a stubby 5mm 1/4" drive, I was able to extract the old sensor. It appears to be full of oil. I have a new Bosch sensor going in, we'll see what happens...
I'd say Sensor has deteriorated and is wicking oil back to wiring connector head, I had similar on my MB, II went ahead and replaced , Later Crankshaft Sensor went, giving same symptoms, intermittent firing after warmed up. replaced. Runs like new.
New Bosch sensor installed (old one was an FAE, installed by the PO about 5 years ago), connector decreased with contact cleaner, old codes erased.
Just took a nice 40 minute freeway drive, trying to cruise at 2800 RPM as much as I could. No further 'hiccups' felt, no codes stored after the drive. Engine seems like it "revs" a little better, but that could be placebo effect at work.
Hopefully I can declare victory at this point.
Hi there, being a more than happy french owner of a 2002 996 Targa I unfortunately have the P0343 code and the symptoms described above.
I have already got the remplacement sensor but there is no way I can unscrew it... lack of space I'm afraid...
How did you succeed in doing this? any tips I should know? special tools?
What I've done so far: remove the air box, unscrew the cooling pipes stand to have so more room.
Thanks a lot.
Just got the dreaded P0343 myself. Car is driving just fine... for now. But figured since the car is 20, probably can't hurt to replace the sensor.
Looks like I need to get myself a small 1/4 inch ratchet to get it out. My 3/8 with a 1/4 adapter is too big to fit in the space.
@VFRMike
did you also have to remove any of the coolant hoses to get the sensor out?
I had kinda forgotten about this project.
Don�t think I removed any coolant lines, but I did support the engine and moved the engine mount plate out of the way a bit (look at posts 12 & 13)
I also used a ball end allen, see attached pic
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