Check Engine Light
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Check Engine Light
I bought a 1997 3.0 Ford Ranger 3 weeks ago.changed spark plugs,wires,ignition coil pak,cleaned battery terminals and new pcv valve. check engine light came on 2 days later. I have an OBD II Code Reader. Code was PO400,EGR Flow Malfuction.Put new EGR in and erased the code.Next day check engine light comes on again!Read the code ,was PO401,EGR flow insufficient detected.That was the PFE sensor.Put new one in and erased the code.A few days later check engine light comes on again!!!I read the code was PO133,O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) This is the sensor before the catalitic converter,I changed it,reset the code.after 58 miles code PO133 came on again,can't believe it!!! what could be the problem? I am not an ediot when it comes to autos , but this is driving me crazy . Can anyone help me? Thanks rangercld.
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
Welcome to FTE!
Sounds like your Ranger is trying to work all the kinks out at once.
Your '97 has two "upstream" (i.e., before the cat) 02 sensors, one for each bank of cylinders. Bank 1 is the passsenger's side of the engine. Is that the sensor that was replaced?
Sounds like your Ranger is trying to work all the kinks out at once.
Your '97 has two "upstream" (i.e., before the cat) 02 sensors, one for each bank of cylinders. Bank 1 is the passsenger's side of the engine. Is that the sensor that was replaced?
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
Originally Posted by rangercld
No the one I replaced was on the drivers side. I guess that is bank 2.If thats the case I changed the wrong one!
Elder User
Joined: Oct 2001
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From: Cypress, CA
I find this interesting. Will the OBD II set a different code for each of the four oxygen sensors? Looking at the sensor locations in the Technical section of this forum, it would be good to associate a particular OBD II code to each sensor so that could test/change the faulty sensor the first time. Just a thought..
Russ
Russ
Elder User
Joined: Sep 2003
Posts: 952
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From: Charlotte, NC
that would make life too easy, if it isn't set up like that, never had to test it myself, so I don't know how its set up, that would be the smart thing to do.
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Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
The codes are indeed particular to the location of the 02 sensors. Look over codes P0131 thru P0171 and also P1128 thru P1158 and you can see how each code points to a specific sensor: OBD-II Diagnostic Trouble Codes
For example, code P0131 pertains to "HO2S-11" which is Ford-speak for "Heated Oxygen Sensor - Bank 1 (passenger side), Sensor 1 (upstream).
For example, code P0131 pertains to "HO2S-11" which is Ford-speak for "Heated Oxygen Sensor - Bank 1 (passenger side), Sensor 1 (upstream).
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