Xsara 1.4 Petrol '02 With Codes

[TonyH]

Hi,

Bought a Citroen Xsara of my neighbour, who is no doubt having a huge laugh at my expense...

Anyway, multiple codes came up together with the EML which had to be sorted out to get the car through an MoT. Diagnostics said injectors, so a new set of injectors purchased and fitted. Made some difference but then light came on again. MAP sensor replaced, new air filter, and butterfly chamber cleaned with carb cleaner etc.

Car runs well when driving around but rough idle as if on three cylinders, and EML comes on again with intake air temperature and fuel trim bank faults.

 

If the fuel trim is adjusted by the landa sensor, would the readings it receives be due to faulty readings by the air temp sensor? Feels like the engine is running 'on choke'. Mpg poor, difficult to start when engine at normal op temp.......

 

Where is the intake air temp sensor please? May just need cleaning??

 

Any other suggestions appreciated.

[paul.h]

I would plug the code reader in again and look at the live data to check the lambda sensor and inlet temp sensor before thinking of replacing them.

 

The inlet lambda sensor should be constantly switching around 1.0 if it is ok and the outlet one should be constant if the cat is working but follow the inlet one if the cat needs replacing. The cat should not really affect performance apart from possibly putting the car in limp mode.

 

You can also check the inlet air temp in the live data, should be about the outside temp of around 15°C before starting the engine and then may warm up a bit to around 30°C. The inlet air temp sensor looks to be part of the throttle body.