17522 Oxygen (Lambda) Sensor

[RussUK]

Hi all,

Was hoping anyone could give any advice on the following error - it has come up twice in the last two weeks, about 1000 miles between each time.

1 Fault Found:
17522 - Oxygen (Lambda) Sensor: B1 S2: Internal Resistance too High
P1114 - 35-10 - - - Intermittent

I'm thinking of purchasing a new lambda sensor and getting it replaced.

Just in case anyone has had the same I thought I'd post on here first.

Many thanks,

[Uwe@Ross-Tech]

I would double-check all connectors between the sensor (the post-CAT one) and the ECU first. Maybe apply some contact cleaner / conditioner.

-Uwe-

[finesse]

Sorry for bring up this old thread. I have the same issue?

Uwe, what contact cleaner and where do apply it. How do you check the ECU?

Thanks

[suthsy]

I have a the same issue...

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
22-AWD -- Status: Malfunction 0010
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
56-Radio -- Status: OK 0000
76-Park Assist -- Status: OK 0000

2 Faults Found
17548 - Oxygen (Lambda) Sensor; B2 S2: Internal Resistance too High
P1140 - 008 - Implausible Signal - MIL ON
16544 - Oxygen (Lambda) Sensor B2 S2: No Activity
P0160 - 004 - No Signal/Communication - Intermittent
Readiness: 0000 0000

Address 08: Auto HVAC
Cannot be reached

any help, ideas, suggestions.... would be much appreciated...

[bearthebruce]

Let's go back to basics. A high resistance indicates non-connection or a broken heater element in the sensor. Before spending money on Oxy sensors, check the connections from the ECU to the rear O2 sensor. Uwe has suggested you go get some contact cleaner for electrical contacts because often the contacts in the connectors under the car get fouled by water and corrosion. Surely an auto parts store near you would be able to recommend a contact cleaner.

Once you have eliminated connection issues, then you move on to replacing the O2 sensor. Before you replace it, you get a DVOM and measure the resistance of the heater. If it is not in spec, you replace it.

Now I know you will ask - what's the spec? Answer: depends on the sensor. A repair manual for your car or the erwin.audi site should have that information.

Make sense?

[suthsy]

Yes perfect sense. Thankyou for your reply. Already ordered some contact cleaner, it will be delivered tomorrow. As for checking the spec, i will look into that tomorrow too. Thanks for your help.

Recently had my car resprayed and alloys refurbished, would the fumes from the paint trigger the sensor to go off?

[suthsy]

so... after weeks of worrying how much money i will have to spend o2 sensors, cat converters, new MAF etc... i have found the problem as to why the exhaust emission light decided to show...

the wires joining the o2 sensor on the left cat had become unstuck and left hanging above the exhaust, eventually they completely burnt through from when the exhaust became hot, which then triggered the o2 sensor as it was unable to function properly. i have pictures to show but dont know how to paste them into the post