Engine Light on - Maf Sensor?

Martin75 · 7th February 2012, 21:33

My IPK engine light has periodically been illuminating (solid not flashing), over the past few weeks. On 2 occasions the local dealer’s scanner showed firstly a front fuel pump fault and then yesterday a Maf / mass air error?

I’d always considered (wrongly), they had a T4, but not so, only a sort of grand daddy version of my own U480 OBD2.

I have a Pierburgh (new at 23k) with a Synergy 2, EGR bypass, and filterless PCV. The car runs faultlessly. Presuming therefore that the physical set up is correct, one contention seemingly is to replace the MAF sensor?

I don’t think my workshop’s knowledge of diesels is that deep, despite their overall competence elsewhere. The car has now covered 63k, last service was at 60k (big one).

Formatively the obvious answer is to find a diesel specialist, with a T4 to gain a more detailed analysis, if such a thing exists? However are there any formative steps, worth trying first?

I’ve attempted wriggling the wires under the bonnet etc, but without effect. Literally one day the tell tales on, the next off.

Any thoughts/experiences please …

wuzerk · 7th February 2012, 21:59

As always the easiest thing to do is remove the connector from the Maf and see if the car runs better. It is my understanding that a below spec Maf will not show up on any test rig,only a completely dead one. If the car is running faultlessly then it is not the Maf anyway.

Martin75 · 7th February 2012, 22:23

Thank you, the workshop tried that with no effect. Whats strange is that the fault reader they had yesterday showed a Maf fault? However as I said, it wasn't a T4.

Last week it showed a pressure fault with the under body fuel pump (facelift).

I seem to remember (dimly) at a Nano once someone relating a story that a fuel pump filter could maybe cause an IPK fault read out, but I may be wrong?

7th February 2012, 21:33	#1
Martin75 Loves to post Rover 75 CDti Auto Saloon 2004 Join Date: Nov 2006 Location: North Essex Coast Posts: 489 Thanks: 4 Thanked 5 Times in 1 Post	Engine Light on - Maf Sensor? My IPK engine light has periodically been illuminating (solid not flashing), over the past few weeks. On 2 occasions the local dealer’s scanner showed firstly a front fuel pump fault and then yesterday a Maf / mass air error? I’d always considered (wrongly), they had a T4, but not so, only a sort of grand daddy version of my own U480 OBD2. I have a Pierburgh (new at 23k) with a Synergy 2, EGR bypass, and filterless PCV. The car runs faultlessly. Presuming therefore that the physical set up is correct, one contention seemingly is to replace the MAF sensor? I don’t think my workshop’s knowledge of diesels is that deep, despite their overall competence elsewhere. The car has now covered 63k, last service was at 60k (big one). Formatively the obvious answer is to find a diesel specialist, with a T4 to gain a more detailed analysis, if such a thing exists? However are there any formative steps, worth trying first? I’ve attempted wriggling the wires under the bonnet etc, but without effect. Literally one day the tell tales on, the next off. Any thoughts/experiences please …

7th February 2012, 21:59	#2
wuzerk Passed Away Rover 75 CDT 03 auto Conn. SE Join Date: May 2009 Location: London Posts: 2,885 Thanks: 104 Thanked 254 Times in 204 Posts	Sensor As always the easiest thing to do is remove the connector from the Maf and see if the car runs better. It is my understanding that a below spec Maf will not show up on any test rig,only a completely dead one. If the car is running faultlessly then it is not the Maf anyway.

7th February 2012, 22:23	#3
Martin75 Loves to post Rover 75 CDti Auto Saloon 2004 Join Date: Nov 2006 Location: North Essex Coast Posts: 489 Thanks: 4 Thanked 5 Times in 1 Post	Thank you, the workshop tried that with no effect. Whats strange is that the fault reader they had yesterday showed a Maf fault? However as I said, it wasn't a T4. Last week it showed a pressure fault with the under body fuel pump (facelift). I seem to remember (dimly) at a Nano once someone relating a story that a fuel pump filter could maybe cause an IPK fault read out, but I may be wrong?