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96 neon engine code 51 #1900736 08/27/15 11:19 PM 08/27/15 11:19 PM
Joined: Feb 2007 Posts: 680 NW IL B Biggie OP mopar
Biggie OP mopar B Joined: Feb 2007 Posts: 680 NW IL	My neon has 64k miles on it. I was getting about 30mpg. Now 21. I tried replacing o2 sensor but it threw same code. Under that code it list a multitude of things it could be. What I don't understand is if it's o2 it should throw that code. If it's a map sensor it should throw that code right. Why is it giving me such a generic code. Vacuum? I dont hear any leaks. Plugged cat? Doesn't idle rough. Any suggestions "Think of all the Ford owners who will someday want an automobile." John Dodge 57 dodge sierra wagon 03 chrysler 300m 10 dodge charger

Re: 96 neon engine code 51 [Re: Biggie] #1901086 08/28/15 01:47 PM 08/28/15 01:47 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	96 Neons are OBDII and give a more detailed code than "51". Get a code reader or take it to a parts store and get the Pxxxx code. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 96 neon engine code 51 [Re: Supercuda] #1901140 08/28/15 02:47 PM 08/28/15 02:47 PM
Joined: Feb 2007 Posts: 680 NW IL B Biggie OP mopar
Biggie OP mopar B Joined: Feb 2007 Posts: 680 NW IL	P0171. Sorry forgot to add that. Fuel pressure reads 54psi at idle "Think of all the Ford owners who will someday want an automobile." John Dodge 57 dodge sierra wagon 03 chrysler 300m 10 dodge charger

Re: 96 neon engine code 51 [Re: Biggie] #1901172 08/28/15 04:04 PM 08/28/15 04:04 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	What that code means is that the engine is seeing a lean condition. It might be the O2 sensor, it might be a vacuum leak, it might be a plugged/weak injector, it might be a wiring/connection issue, it might be an EGR issue. I read one guy had oil in his connector at the ECU that caused this code. It does not necessarily mean the O2 sensor is the problem. Fuel pressure at idle might be ok, but what is it under load? At cruise? Gonna have to do some troubleshooting to narrow it down. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

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