Hi all new here and need some help please.

[Excalibur1976]

Hi all new here and hope to learn some stuff, I have new to me an audi a7 3.0 be 272bhp. Love the car and only had it 5 months she's done 85k now. Zero timing chain noise but I have 1 code that is p191a00 loss of crankshaft synchronisation on my autel , I only get 1 or 2 frequencies per drive cycle and the car runs perfectly with no noise so that makes me wonder if it is a chain/tensioner problem. I'm a tech at at a jlr dealership so I've seen plenty of inginium engines with that code and they are rattling there **** off but I've never had anything to do with these engines so could do with some help. I was thinking oil from the rear main on to the flexi plate and going on the sensor maybe but don't think it's leaking oil. Bit lost really with it running so well. I just did another oil and filter change to see if that would help but not helped. P.s the fault doesn't bring up the eml on the dash either so I wouldn't know if I never plugged it in.

[Crasher]

Many years ago when I read the design spec for the Ingenium I shock my head in disbelief at timing chains. The symptom is the chains on their way out, it is a HUGE job. After the oil change, did it initially do the rattle of underwear soiling?

[czechitout]

Given your experience as a technician at a JLR dealership, you're right to approach this situation with caution and seek advice, especially since you're not familiar with these engines. While it's difficult to diagnose the exact cause without further inspection, Your suspicion about oil from the rear main potentially affecting the flexi plate and sensor is a valid consideration. It's worth examining the area around the rear main seal for any signs of oil leakage or seepage. Even if you haven't noticed any oil leaks, it's still possible that a small amount of oil could be affecting the sensor intermittently.
Faulty sensor: The crankshaft position sensor could be malfunctioning intermittently, leading to sporadic fault codes. Inspecting and possibly replacing the sensor might be necessary.


Otherwise it could be the following,

Wiring or connection issues: Check the wiring harness and connectors related to the crankshaft position sensor for any damage, loose connections, or corrosion. A poor electrical connection could trigger intermittent fault codes.


Software issue: In some cases, a software glitch or calibration error could lead to false fault codes. If other potential causes are ruled out, it might be worth considering an update or reflash of the engine control unit (ECU) software.