P3027 Flowmeter signal Air flow too low

[maciejz]

Hello.

I can't get rid of the P3027 Flowmeter signal Air flow too low fault in my Citroen C5 X7 RHR 2.0 HDI Sedan from 2009. The problem is occuring since I bought the car.

I replaced all filters, the air sensor (to NTY ECT-CT-000), I cleaned my air intake.

If I clear the faults, the P3027 fault appears again right after ignition. Always. I haven't noticed any symptoms personally, but I haven't driven any other car of my model.

What may be a reason for the fault?

[toolfan]

Some aftermarket sensors fail right out of the box. I would try to get an "expensive" one from another brand to confirm or not.

[myglaren]

Seimens/VDO are the reliable and OEM ones (VDO a Siemens spinoff company)

[steveclv]

I have had something similar with other cars - cleaning the element of the MAF (Mass Airflow Sensor) has worked - use brake cleaner and never touch the wire. But failing that then a quality replacement sounds like the next thing to try.

[wheeler]

Have you looked at live data from the flowmeter? what does it read at idle?
To confirm are you saying that after you clear the fault & switch just the ignition on (without starting the engine) the fault code comes straight back? or does the fault only come back once the engine has been running?

[cit-rotti]

There are special air mass sensor cleaners, e.g. from Liqui Moly No.4066. All other cleaners are suboptimal.

Please check the multi-pole wiring harness - such faults are often caused by defective cables or connections - the power connection in particular is suspect.

A suitable wiring diagram would be helpful.

Greetings Wolfgang