2003 Neon SE - Horrible Gas Mileage (14mpg) and Lack of Power

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2003 Neon SE - Horrible Gas Mileage (14mpg) and Lack of... - 4/16/2008 1:10:30 PM    dannysporea   Posts: 4 Joined: 4/16/2008 Status: offline Hi all, I have a problem with my wife's car, an automatic 2003 Neon SE: it has a horrible gas mileage - 14 mpg city driving and lack of power. It has 80k miles. I'm comparing the lack of power to my manual 2004 Mitsubishi Eclipse GS (4 cyl, 2.4L) which might not be really accurate, yet the Dodge power is feeling way lower than the Mitsubishi, which I don't think it should be the case. Changed the spark plugs, had a full fuel system cleaning done at Meineke, changed the air filter, checked the tire pressure... no improvement. The check engine light is not on... I don't even know if the SE has a check engine light, I didn't notice it, maybe I should go at AutoZone and directly use an ODB2 scanner to check it ? Any ideas ? Thank you, Danny Post #: 1

RE: 2003 Neon SE - Horrible Gas Mileage (14mpg) and Lac... - 4/17/2008 9:44:38 PM    N30N Posts: 602 Joined: 3/25/2008 From: Florence Kentucky Status: offline you should be able to check the codes http://www.dodgeforum.com/m_409789/tm.htm _____________________________ 02 dodge neon es (R1c3rs B3wAr3) karr,Iowa,mat=bR0TH3RS 4 L1F3 (in reply to dannysporea) Post #: 2

RE: 2003 Neon SE - Horrible Gas Mileage (14mpg) and Lac... - 4/18/2008 10:30:41 AM    12 volt Posts: 1344 Joined: 8/4/2007 From: roswell New Mexico Status: offline quote: go at AutoZone and directly use an ODB2 scanner to check it ? thats i good idea i bet its the o2 sensor _____________________________ 98 neon Sport mtx/DOHC audio system, toggle switch ignition, K&N insert 95 neon (parts car) 91 BMW E34 (in reply to N30N) Post #: 3

RE: 2003 Neon SE - Horrible Gas Mileage (14mpg) and Lac... - 4/19/2008 5:52:26 AM    voidfinger   Posts: 3 Joined: 4/19/2008 Status: offline what is the best o2 sensor to run on these neon's?  mines a 99 and i'm wanting to replace it but i dont know which is the best.  Thanks (in reply to 12 volt) Post #: 4

RE: 2003 Neon SE - Horrible Gas Mileage (14mpg) and Lac... - 4/30/2008 2:44:06 AM    N30N Posts: 602 Joined: 3/25/2008 From: Florence Kentucky Status: offline post it man _____________________________ 02 dodge neon es (R1c3rs B3wAr3) karr,Iowa,mat=bR0TH3RS 4 L1F3 (in reply to voidfinger) Post #: 5

RE: 2003 Neon SE - Horrible Gas Mileage (14mpg) and Lac... - 5/13/2008 10:42:44 AM    dannysporea   Posts: 4 Joined: 4/16/2008 Status: offline No codes, everything clean. I'll try to replace the o2 sensor this week... Should I replace both the upstream and downstream sensors, or only the upstream is enough ? What type is the best ? Thanks ! (in reply to N30N) Post #: 6

RE: 2003 Neon SE - Horrible Gas Mileage (14mpg) and Lac... - 5/14/2008 9:29:58 PM    IowaNeon04 Posts: 798 Joined: 1/4/2007 Status: online I just hit 80k miles but back at about 75k I started having a drastic drop-off in mileage too. No codes on the dash. I went to O'Reilly's Auto Parts and got me a direct-fit Bosch on sale for $24.95... gained 10 mpg from the swap (back up around 36 mpg combined city and highway now). _____________________________ Ptschafer 2.0 is here... (in reply to dannysporea) Post #: 7

RE: 2003 Neon SE - Horrible Gas Mileage (14mpg) and Lac... - 6/3/2008 6:13:53 AM    dannysporea   Posts: 4 Joined: 4/16/2008 Status: offline Guys, I changed the O2 sensor with a Bosch from AutoZone. Now the problems started: - the computer started throwing the P0132 code for the new sensor; - I disconnected the battery to see if the code comes back and it came; - I changed again the O2 sensor with the old one and reset the PCM again; - after a while, P0700 came and the car is in limp mode (the transmission isn't changing higher than the 2nd gear), but no more P0132 Please help ! Could the O2 sensor be causing transmission codes ??? My next plan of action would be to return and replace the new O2 sensor at AutoZone, reset the computer again and see what codes (if any) it will throw... Any ideas ? Thanks, Danny (in reply to IowaNeon04) Post #: 8

RE: 2003 Neon SE - Horrible Gas Mileage (14mpg) and Lac... - 6/3/2008 5:29:03 PM    dannysporea   Posts: 4 Joined: 4/16/2008 Status: offline UPDATE: Together with the P0700 code, there is also P0755, I got it checked at AutoZone... What should I do next ? Go to the stealership ... ? (in reply to dannysporea) Post #: 9

RE: 2003 Neon SE - Horrible Gas Mileage (14mpg) and Lac... - 6/3/2008 7:54:48 PM    Ghost Neon 2   Posts: 497 Joined: 12/21/2006 Status: offline Doesn't your atx have a sensor on it? Could this be a sensor failure? Fluid change perhaps. _____________________________ Angels on the side lines. Baffled and confused. Father blessed them all with reason, cause this is what they choose. (in reply to dannysporea) Post #: 10

RE: 2003 Neon SE - Horrible Gas Mileage (14mpg) and Lac... - 6/3/2008 9:54:29 PM    IowaNeon04 Posts: 798 Joined: 1/4/2007 Status: online WalMart now sells the good stuff... the Mopar high-base transmission fluid for like $4.50 a quart. Cheaper than the delaer by far. Stock up on it lol. _____________________________ Ptschafer 2.0 is here... (in reply to Ghost Neon 2) Post #: 11

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