Ford Focus lambda sensor fault.

[Ricky_M]

Looking for some assistance on my 2001 Ford Focus 2.0 Petrol.

Just had a diagnostic check carried out on my car as the EML has come on. It came back with fault code P0135, which I believe is a fault with the lambda sensor.

First question, how do I tell which one is at fault?

Second question, before I fork out for a new sensor are there any checks I can perform to eliminate any other causes of the fault code?

Thankyou in advance.

[stevieturbo]

Ricky_M said:

Looking for some assistance on my 2001 Ford Focus 2.0 Petrol.

Just had a diagnostic check carried out on my car as the EML has come on. It came back with fault code P0135, which I believe is a fault with the lambda sensor.

First question, how do I tell which one is at fault?

Second question, before I fork out for a new sensor are there any checks I can perform to eliminate any other causes of the fault code?

Thankyou in advance.

Because more than likely there is only one to be at fault ?

Whoever carried out the "diagnostic" should be able to check the sensors output with an oscilloscope.

[Zoobeef]

It relates to the front sensor which is the pre cat one i think?

First thing to check is the fuse for it and pull the fuse out and see if theres any corrosion in the connector. Free things to check