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Check engine light - Air filter or MAF Ssensor ? #4563040
11/03/17 12:57 PM
11/03/17 12:57 PM
Joined: Jun 2009
Posts: 281
NY
sleepery Offline OP
sleepery  Offline OP
Joined: Jun 2009
Posts: 281
NY
The check engine light came on in my 99 Explorer . I looked under hood and noticed a vacuum hose partially inserted just past the MAF sensor . I inserted the hose fully and decided to clean the MAF . When I opened the air filter cover the air filter was crushed and pushed down in the housing not sealed around the perimeter . I reinstalled the filter and cleaned the sensor let dry and light went off .

I had a shop replace the alternator not too long ago and imagine they took the cover and hose off to get to the alternator and just laid the alternator(or something heavy) right on the air filter while working, crushed it and put the cover back on.

I am wondering if it was the MAF cleaning or the air filter being put back in place that cleared the check engine light ?
Should I consider replacing the MAF Sensor seeing that it is the original or leave it be for now ?

Re: Check engine light - Air filter or MAF Ssensor ? [Re: sleepery] #4563045
11/03/17 01:02 PM
11/03/17 01:02 PM
Joined: Oct 2014
Posts: 12,578
Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 12,578
Idaho
Clear the codes . Do what it takes to bring the restore the parts back tpo proper , then drive the vehicle and see if the codes come back. Then go from there.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Check engine light - Air filter or MAF Ssensor ? [Re: sleepery] #4563070
11/03/17 01:37 PM
11/03/17 01:37 PM
Joined: Sep 2014
Posts: 1,489
Toronto Canada
WobblyElvis Offline
WobblyElvis  Offline
Joined: Sep 2014
Posts: 1,489
Toronto Canada
In my opinion, MAF sensors don't actually fail very often but they do need cleaning. If you suspect the MAF, clean it before spending the big money.

Re: Check engine light - Air filter or MAF Ssensor ? [Re: sleepery] #4563095
11/03/17 02:17 PM
11/03/17 02:17 PM
Joined: Jan 2008
Posts: 4,023
Guilford, CT
exranger06 Offline
exranger06  Offline
Joined: Jan 2008
Posts: 4,023
Guilford, CT
The air filter would not cause a check engine light. The MAF can't tell if the air is filtered or not. It just measures the volume of air going through it. The breather hose being loose however WILL cause a check engine light, as it lets in additional air to the intake that the MAF did not measure. Don't replace the MAF unless it's actually bad.


2006 Ford Ranger Sport
1992 Honda Accord EX
2004 Honda CR-V LX
1994 Ford Bronco XLT (project)
2011 Cadillac Escalade ESV (wife's)
Re: Check engine light - Air filter or MAF Ssensor ? [Re: sleepery] #4563250
11/03/17 05:33 PM
11/03/17 05:33 PM
Joined: May 2009
Posts: 511
Hawaii, USA
anndel Offline
anndel  Offline
Joined: May 2009
Posts: 511
Hawaii, USA
Go to any auto parts store, O'Reillys, Autozone, Advance, Pep Boys (but not NAPA, as they don't loan tools for free) and borrow a scan tool to check codes. It may be due to the disconnected hose but just to be sure and the scan tool can clear codes. MAFs are expensive and it may be something else.

In our 05 Toyota Avalon, I replaced the coil packs which required the throttle body removed (it contains the MAF sensor). When I reinstalled it and cleared the codes, the engine ran at a high idle so I disconnected the battery for 10 minutes then reconnected it and started the car. It ran fine after that reset.


1993 Toyota 4x4 p/u, 2.4L 22RE 4 cyl - Amsoil SS 10W-30, Yota OEM Filter
2005 Toyota Avalon XL, 3.5L V6, Amsoil SS 5W-30, Yota OEM Filter
2014 Toyota Tacoma 4.0L V6, Amsoil SS5W-30, Yota OEM Filter

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