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CEL light is on #1362988 08/17/05 05:19 AM
Joined: Aug 2005 Posts: 10 Cowlitz county; Washington M Michael41 OP New CEG\'er
OP Michael41 New CEG\'er M Joined: Aug 2005 Posts: 10 Cowlitz county; Washington	1997 V6 Cotour 115K+ miles ATX CEL came on 3 years ago; about 2 months ago noticed a change in performance and gas millage any Ideas? Whent to "Jiffy Lube" to get the codes read for free; no "autozone" near Longview WA P0153 Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 2. P0171 System Too Lean - Bank No. 1. P0174 System Too Lean - Bank No. 2 P0300 Random Misfire Detected. P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2. 1997 Contour LX Red 2.5L V6 (170hp) 115+ miles

Re: CEL light is on #1362989 08/17/05 05:22 AM
Joined: Oct 2003 Posts: 5,143 Ypsilanti, Mi A AliasJerk�?� Addicted CEG\'er
AliasJerk�?� Addicted CEG\'er A Joined: Oct 2003 Posts: 5,143 Ypsilanti, Mi	I honestly think all of those codes have to do with one oxygen sensor. as for CEL's... GET THEM CHECKED! I hate it when people get a check engine light and dont do anything about it.. "oh it still drives fine" When the light is on... something is wrong. Read the code, fix it, light goes away. all is happy. Anyways, my idea is the oxygen sensor... 98 Corolla LE 1.8L DOHC 1ZZFE TEIN H.Tech Springs Tokico HP series Struts Short ram air intake Tsudo Axel Back Exhaust ... if a jelly fish stung me.. would you pee on the wound?

Re: CEL light is on #1362990 08/17/05 05:33 AM
Joined: Jul 2001 Posts: 7,100 San Antonio/Austin, TX R Ray_dup1 Addicted CEG\'er
Ray_dup1 Addicted CEG\'er R Joined: Jul 2001 Posts: 7,100 San Antonio/Austin, TX	Normally, the odds of having two O2's go bad at once are slim to friggin none.. however, since this code has been ongoing for 2+ years, and you can't tell in what order each code came up, the possibility is there. It sounds, to me, like you have a massive gasket or vacuum leak. the only way to run THAT lean acoss the board (affecting all o2's) Ray '99 CSVT - Silver #222/276 In a constant state of blow-off euphoria. Originally posted by Kremitthefrog: I like to wear dresses and use binoculars to watch grandmas across the street.

Re: CEL light is on #1362991 08/17/05 05:34 AM
Joined: Jun 2005 Posts: 5,345 Virginia, USA T Tony2005 Addicted CEG\'er
Tony2005 Addicted CEG\'er T Joined: Jun 2005 Posts: 5,345 Virginia, USA	Originally posted by Michael41: 1997 V6 Cotour 115K+ miles ATX CEL came on 3 years ago; about 2 months ago noticed a change in performance and gas millage P0153 Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 2. P0171 System Too Lean - Bank No. 1. P0174 System Too Lean - Bank No. 2 P0300 Random Misfire Detected. P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2. If you haven't changed the spark plugs before I would suggest doing that first. Also check to make sure the spark plug wires are seated properly (and the correct firing order is in). FIREWALL 4-6-5 <--coil pack 3-2-1 1-2-3 <--engine 4-5-6 BUMPER http://www.obd-codes.com/trouble_codes/generic/p0300-random-multiple-cylinder-misfire-detected.php You may also want to consider checking for vacuum leaks and exhaust leaks or stuck EGR, dirty MAF, PCV. http://www.v8sho.com/SHO/TSB0197HO2SServiceTips.htm And yes, O2 sensor for upper Bank 2 (near radiator) could also be the culprit. Last edited by Tony2005; 08/17/05 05:39 AM. "Always do the cheap and easy ones first." 1996 V6 ATX 96K miles

Re: CEL light is on #1362992 08/18/05 05:19 AM
Joined: Aug 2005 Posts: 10 Cowlitz county; Washington M Michael41 OP New CEG\'er
OP Michael41 New CEG\'er M Joined: Aug 2005 Posts: 10 Cowlitz county; Washington	thanks will try replacing sparkplugs. 1997 Contour LX Red 2.5L V6 (170hp) 115+ miles

Re: CEL light is on #1362993 08/19/05 01:19 PM
Joined: Sep 2002 Posts: 1,788 St. Louis, MO P projectSHO89_dup1 Hard-core CEG\'er
projectSHO89_dup1 Hard-core CEG\'er P Joined: Sep 2002 Posts: 1,788 St. Louis, MO	Chances are, you will need most or all of the following: Plugs Wires Front upstream O2 sensor Manifold gaskets or PCV valve/hose Steve 98 Contour SE Sport 2.5 Duratec ATX The wifey's car 89 Taurus SHO - 246K miles 94 SHO ATX - 190K 1997 F-150 5.4L ATX - The Workhorse 150K. ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!

Re: CEL light is on #1362994 08/19/05 05:25 PM
Joined: Feb 2003 Posts: 5 R r_u_stuck2 Newbie
r_u_stuck2 Newbie R Joined: Feb 2003 Posts: 5	One of the easiest things you can do is clean the MAF sensor. My daughter's car posted a 172 and 176 code on a 95 Mystique v6. She is 3 states away. I checked with my local mechanic who had previously worked on the car. He states that with all Ford products the MAF gets dirty very easy. This changes the resistance through the little wires. The O2 sensors are programmed to accept what the MAF says as fact and this will cause them to post the lean codes. Takes about 5 minutes and the only problem is the torx screws are the anti-theft type. Posting a link below that shows how to clean but uses another vehicle as an example. http://www.berrysweb.com/clean_your_maf.htm http://www.fordf150.net/howto/clean-maf-mass-airflow-sensor.php

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