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Leaking PCV valve, low oil, hesitant power, fault code - related?


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Bear with me folks on this one. I have searched this forum and others but haven't been able to get a definitive answer.

My PCV valve was cracked and leaking, so I ordered one from Ford as you do. Before I was able to collect and fit it, I noticed the car was a bit hesitant on half throttle at low-ish revs. I put this down to the leaking breather. So I fitted the breather, and noticed there was a bit more oil around the old pipework than I had expected.

I checked the oil and it appeared to be very low (as in, no reading from the dipstick at all!) Put a litre in and will be putting some more in tonight. Car was still hesitant so I ran VAG-COM and got fault codes:

00522 Engine Coolant Temperature Sensor -G62

01247 EVAP Canister Purge Regulator Valve -N80

01259 Fuel Pump Relay Circuit -J17

I have heard that the temp sensor might cause poor running so I will re-scan tonight and fit a new one if it's still faulty. Don't think the other two codes are relevant...

Could the oil use be down to the leaking breather alone (didn't notice any smoke from exhaust at any time over the least few weeks)?

Could the low oil and/or faulty temp sensor make the car run a bit hesitant and judder at low revs? It doesn't feel like a misfire but I will check the coilpack/leads and plugs tonight. Plugs and leads were changed just over a year ago so I don't expect it to be the problem.

Any thoughts appreciated... ;)

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