Lambda and Catalyst: codes 16804 and 16514

[RichN]

Hi guys..

I'm getting the following codes regularly after clearing them..

16804 - Catalyst System: Bank 1: Efficiency Below Threshold
P0420 - 35-00 - -

16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit
P0130 - 35-10 - - - Intermittent

I get an occasional pop/misfire between gears when booting it. No other codes logged.

I've done a fair bit of searching and it seems some folks found a lambda replacement solved it, others did plugs. Can anybody suggest a cheap source of lambda probes? ...and is B1 S1 the one before the cat?

 

[RichN]

Well, I've found some info now..

Manufacturer Part..........................................Bosch Part
06A906260N (Front sensor)...........................0258006213
6K0906262B (Rear Sensor)...........................0258006266

Off to buy front sensor from eBay - can somebody add this to the parts FAQ, it might help us save cash.

B1 S1 is indeed before the CAT.

 

[RichN]

Well, I started and finished my own question here so I thought I'd post up that a change in Lambda sensor, pre-cat seems to have resolved this. I found the part for £65 on eBay, the original Bosch sensor as above, which is much cheaper than the dealer.

Easy to change, too.

Hopefully this will help someone in the future.

 

[Indy]

Hi, Got the same error today when getting the MOT done...

16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit
P0130 - 35-10 - - - Intermittent

You have answered my question regarding where the sensor is B1 S1 before cat and will have a go at this over the weekend. Thanks.