O2 sensor before cat

[Brian James]

Hi,
1999 1.9 Z3 M43 B19
Just got the engine icon light come on - analysis: a code P0130 refferring to the sensor before the cat. Have cleared the fault and light is extinguished. However, need to source a possible replacement, part number I believe is 11781247406.

Would be very appreciative if you could advise on best make as Autodoc etc are throwing up various manufacturers - Ridex,Stark,Engitech,Bosch,Vemo to name just a few. - I will be keeping the car so don't want to rework this.

Also any advice on getting the sensor out - pipework looks sound around the sensor.

As always, many thanks in advance for all your help
Kind Regards
Brian

 

[NZ00Z3]

P0130, 10 (Dec), Lambda Sensor Pre Cat Bank 1 Sensor 1

Bosch are the sensors to go for. Just make sure that it is one for your car and not a universal fitting one. The universal sensors have a silly connector box that you use to connect the original plug.

General rule of thumb, if the sensors have more than 120,000 miles on them, just change them.

 

[bernd]

Just changed my pre-cat sensor today. Bosch sensor is £75 at Eurocarparts (if you're in the UK). As for getting it out, I used a 22mm ring spanner plus a second large spanner as extension. It needed quite a bit of force, but came out eventually...

 

[AntStark]

I also went for the Bosch..no issues since and running 100% better.

 

[Matthieus5s]

I just changed my cat & the sensor was so seized on I had to clamp it in a bench vice & turn the exhaust around it to start undoing it. I probably should have probably used a long Stilson wrench but with the car on a jack it's difficult to get enough swing!

 

[Brian James]

Many Thanks guys - much appreciated will source a Bosch one

 

[colb]

Agree go for a Bosch replacement with the correct connector not a universal one where you have the faff of connecting wires. I found a Ring spanner worked better than a Lambda socket to get the old one out. Aid the unscrewing with some penetrating spray but dont contaminate the new one when you screw that in. A little copperease grease on the thread should be ok to use when screwing the new one in but keep it off the probe end.

 

[Brian James]

Sourced a Bosch one from Autodoc - delivery was about 2 weeks and happy with the fact that it was a genuine Bosch made in USA.

Managed to get the old one out quite easily with a 22mm ring spanner. The new Bosh unit came with the threads already coated in a grey gease like substance so did not alter this. Nice to see that the new one came with a plastic protective covering on the sensor probe so fingers crossed this should eliminate this problem.
Once again many thanks for the useful feedback.