by RAZ5454 on December 13th, 2006

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I have a 2003 ranger, 3.0 V6 & the check engine light comes on. The codes read "left bank running rich" & "right bank running rich". It still starts & runs fine though. Any ideas?

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by spud_potatoes on December 14th, 2006
I would have to say that the oxegyn sensor is down. Because I have heard that it is a common thing in a ranger mainly the two-thousands and up.
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by GARY MARSHALL on December 13th, 2006
Sounds like the oxygen sensor is bad
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by KnivesX11 on December 13th, 2006
It sounds like you oxygen sensor is off. As long as it runs fine you should be OK.
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- I again scanned it and it still said bank one rich and found the 02 sensor was reading rich so we replaced it but the light came back on. Why does it scan as a bad 02 sensor but replacing it doesn't fix it?
  
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  by RAZ5454 on December 15th, 2006
- We scanned it again and now it's back to saying both banks are rich. We tested the IAC valve and found it is not opening even though it sounds like it is, the plunger is not moving. Hopefully this is the problem
  
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  by RAZ5454 on December 19th, 2006
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by Anonymous on October 20th, 2007
i had 2003 ranger with 89000 miles that caught on fire after check engine came on i had then reset the light they said . problem was fixed and then check engine came on again and wasb running rich and slugglish woulf this cause the vehicle to go up in flames
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by dangerranger95 on October 28th, 2008
i have had the same problem and it is more than likely the o2 sensor, another possibility is your catlytic convertor
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by sevu97224 on December 22nd, 2006
I,d take a look at the mass air flow senser, and also look at fuel pressure. pull vacum hose off fuel pressure regulator and see if there,s sign,s of gas (bad diaphram), you may try cleaning mass air flow senser first, use only cleaner approved for such use so you don,t damage it
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- That's what we were thinking too (MAF). We checked the fuel press and it was where it belonged. Since I traded the truck off I'll never find out what it was.
  
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  by RAZ5454 on December 23rd, 2006
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by RAZ5454 on December 14th, 2006
Well the light came back on again! I scanned it again and now it shows no codes but when we hooked up the computer the left oxygen sensor keeps reading rich while the others keep switching between rich and lean, like they should. Could I have 2 sensors go out at the same time or could it be something else?
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by RAZ5454 on December 14th, 2006
That was my thought too but I've noticed my gas mileage is down now. Could a bad oxygen sensor do that?
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- yep it sure can. a bad o2 sensor can lead to horrible gas mileage.
  
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  by and2balla23 on December 22nd, 2006
- We found the idler air control valve was not opening so we replaced it but it didn't fix the problem. Now we are thinking the mass air flow sensor. ended up trading the truck (straight across) for a 2004 Mustang so problem solved (lol). Thanks for all your help.
  
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  by RAZ5454 on December 22nd, 2006
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by RAZ5454 on December 14th, 2006
I replaced the rear sensor (it has 3) and cleared the codes and so far so good, no codes came up and no 'check engine' light. A big thanks to everyone for your help.
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by scott on September 3rd, 2010
Get a can of Mass Air Flow Sensor cleaner. Take out the plug for sensor spray it up and have Auto Parts store reset the Engine Light.This worked on my 02 Windstar.
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by and2balla23 on December 22nd, 2006
Its possible that if your ranger has 4 o2 sensors they could all have gone out. It kind of pricy so you should try changing out two at a time.
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- Nope, only 3 and all good.
  
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  by RAZ5454 on December 23rd, 2006
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I have a 2003 ranger, 3.0 V6 & the check engine light comes on. The codes read "left bank running rich" & "right bank running rich". It still starts & runs fine though. Any ideas?

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Question

I have a 2003 ranger, 3.0 V6 & the check engine light comes on. The codes read "left bank running rich" & "right bank running rich". It still starts & runs fine though. Any ideas?

Answers. 11 helpful answers below.

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