d6lc

My 2007 S8 (101k) has been throwing a cell lately, I cleared it at first hoping for the best but its back. VCDS scan shows:

000048 - Oxygen (Lambda) Sensor B1 S1: Heating Circuit

P0030 - 004 - Malfunction / Open Circuit - Intermittent - MIL ON

Freeze Frame:

Fault Status: 10100100

Fault Priority: 0

Fault Frequency: 5

Reset counter: 255

Mileage: 163965 km

Time Indication: 0

Date: 2018.03.15

Time: 13:35:45

I searched and cannot find anything specific to the S8, There were some A8 comments around cleaning the connections that seems to address the issue.

Anyone had this on an S8 and fixed it, please god don't say its an engine out job

MP4.2+6.0

I had the W12, but to me the "Intermittent"right in the code says indeed look hard at the connectors. Find the B1S1 one--front left of the motor/exhaust as you look at it under the hood--and open the connector. Clean it and apply some Deoxit or something similar. Just get it into the terminals, like with a tooth pick or jeweler's little screwdriver. If that solves it, then done, at least for a while.

If that fails, I would try the W12 TSB fix. You replace the car side connector--which is why the O2 changes may not even help. BTDT. At the same time you splice in new jumper wires that form the pins of the connector. Not hard to do; find my prior threads/posts on it from the W12. Dealers sell the connectors(s) and the pre crimped terminal jumper wires.The issue per the TSB for at least W12's is the solder or join right at the connector crimp was sub par.

d6lc

ScottCNelson

[QUOTE=d6lc;25127228]My 2007 S8 (101k) has been throwing a cell lately, I cleared it at first hoping for the best but its back. VCDS scan shows:

000048 - Oxygen (Lambda) Sensor B1 S1: Heating Circuit

P0030 - 004 - Malfunction / Open Circuit - Intermittent - MIL ON

Freeze Frame:

Fault Status: 10100100

Fault Priority: 0

Fault Frequency: 5

Reset counter: 255

Mileage: 163965 km

Time Indication: 0

Date: 2018.03.15

Time: 13:35:45

I searched and cannot find anything specific to the S8, There were some A8 comments around cleaning the connections that seems to address the issue.

Anyone had this on an S8 and fixed it, please god don't say its an engine out job [/QUOTE

Here's what I have on your problem. Not so sure about waiting weeks to address this - you do know a bad O2 sensor can lead to a ruined CAT and $$$$$$.

d6lc

ScottCNelson

B1S1 referred to by P0030 is Bank 1 (CAT I) 1 Sensor 1 as Z19 is the upstream O2 sensor of CAT1, #7 on the diagram. Cat I is on the rear passenger side serving cylinders 1-3. If you have VAG-COM you may also see errors indicting that bank is running rich/lean and or misfiring (these are from my S8 with a faulty O2 on Bank 3:

004226 - Mixture Regulation; Bank 3; Range 2
P1082 - 001 - Lean Limit Exceeded - Intermittent

00768 - Random/Multiple Cylinder Misfire Detected
P0300 - 002 - - Intermittent

d6lc

Came back from vacation today and drove the car, CEL on as expected at first. Stopped and drove the 2nd time and the CEL is off, another trip a little later and the CEL is still off. I haven't touched the car for a week whist away. I'll try and run another scan this weekend.