99 Explorer code question?
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New User
Joined: Jan 2004
Posts: 4
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From: KY
99 Explorer code question?
I have a 99 Explorer and the check engine light has been on lately. I had the codes pulled tonight and I was wondering if someone could tell me what they mean
P0306
P0171
P0174
Any insight that can be provided would be very much appreciated.
Thanks
P0306
P0171
P0174
Any insight that can be provided would be very much appreciated.
Thanks
Posting Guru
Joined: Aug 2000
Posts: 1,984
Likes: 2
Assuming it's a 4.0 SOHC...?
306 = cylinder #6 misfire
171 = system lean, bank 1
174 = system lean, bank 2
Try changing the plug/wire on #6 (driver's side rear) to clear the PO306
The 171 and 174 are probably related, and are usually caused by a vacuum leak or dirty MAF sensor. You could have a leaking intake manifold gasket(s) causing the vacuum leak, very common on the 4.0. Try re-torquing the intake bolts first, see if that helps. If not, you may have to replace the O-ring gaskets.
306 = cylinder #6 misfire
171 = system lean, bank 1
174 = system lean, bank 2
Try changing the plug/wire on #6 (driver's side rear) to clear the PO306
The 171 and 174 are probably related, and are usually caused by a vacuum leak or dirty MAF sensor. You could have a leaking intake manifold gasket(s) causing the vacuum leak, very common on the 4.0. Try re-torquing the intake bolts first, see if that helps. If not, you may have to replace the O-ring gaskets.
