does anyone out there know if fault codes 17526 and 16524 lambda probe sensor - bank one sensor 2 refers to the probe before the cat or the one after the cat so that I can buy the proper one and not end up changing the wrong item -especially at the price skoda charge !!

Looking at the Haynes Manual for the VW Golf, sensor 1 is in the exhaust manifold and sensor 2 is at the rear of the cat for 1.4 and 1.6 DOHC engines.

What is your engine code, ie a 3 letter one?

Hello,

I have Skoda fabia 1,4, 2000, AQW. I made a test with VAG COM and I got next Faults:

4 Faults Found:

17526 - Oxygen (Lambda) Sensor Heating: B1 S2: Open Circuit

P1118 - 35-00 - -

17549 - Load Calculation Cross Check: Implausible Value

P1141 - 35-10 - - - Intermittent

16555 - Fuel Trim: System Too Lean: Bank 1

P0171 - 35-10 - - - Intermittent

16524 - Oxygen (Lambda) Sensor B1 S2: No Activity

P0140 - 35-10 - - - Intermittent

B1S2 is rear sensor. But can I be sure it is damaged. The first fault makes me doubts (17526 - Oxygen (Lambda) Sensor Heating: B1 S2: Open Circuit). What do you think?

What does it mean other two faults?

Thank you.

Check out the codes here.

http://wiki.ross-tech.com/wiki/index.php/Category:Fault_Codes

DB.

The code explainations are to take into account V and W engine cylinder layouts, where there are banks of cylinders with separate exhaust downpipes and the resulting multiple lambda probes. In an inline engine there is only 1 bank of cylinders - bank 1 and from (I think) Euro III emissions standards, there is catalyst monitoring, hence the probe after the catalyst. Bank 1 sensor 1 B1, S1 is before the catalyst, bank 1 sensor 2 B1 S2 is after the catalyst.

The faults in post #3 look related to the second probe fault, as if that probe were faulty it wouldn't be monitoring the catalyst effectively. The ECU will start correcting the fuel trims before it realises that the probe is giving some bad readings. Replace the probe and for good measure erase the learned values in the ECU (01, 00, channel 00) and adapt the throttle body.

For the sensor to work effectively, it needs to be hot as soon as possible, so it has an in built heater to acheive that, it is almost certain that this heater is faulty.

Hi,

Thank you. I will replace lambda sensor.

Then I will report.

Regards.

Could be fuel pump relay, if lambda probe doesn't cure it.

The code explainations are to take into account V and W engine cylinder layouts, where there are banks of cylinders with separate exhaust downpipes and the resulting multiple lambda probes. In an inline engine there is only 1 bank of cylinders - bank 1 and from (I think) Euro III emissions standards, there is catalyst monitoring, hence the probe after the catalyst. Bank 1 sensor 1 B1, S1 is before the catalyst, bank 1 sensor 2 B1 S2 is after the catalyst.

The faults in post #3 look related to the second probe fault, as if that probe were faulty it wouldn't be monitoring the catalyst effectively. The ECU will start correcting the fuel trims before it realises that the probe is giving some bad readings. Replace the probe and for good measure erase the learned values in the ECU (01, 00, channel 00) and adapt the throttle body.

For the sensor to work effectively, it needs to be hot as soon as possible, so it has an in built heater to acheive that, it is almost certain that this heater is faulty.

Hi fordfan,

I'm a beginner with VAG COM program. I found manual on Ross tech site how to adapt the throttle body. This will not be the problem.

But I don’t know how to erase the learned values in the ECU. I don’t know the meaning of the numbers which you typed (01, 00, channel 00). And I don’t find this on the net.

Can you please explain this to beginner (that’s me).

Thank you.