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Old 10-10-2015
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I am: Pat Baldridge
Join Date: Dec 2014
Location: New Iberia, Louisiana
Vehicle: 2000 ford ranger
Drive Type: 4x2
Engine: 3.0
Posts: 1
Total Props: 0
check engine light on

2000 ranger w/3.0 engine. check engine light staying on, could it be an 02 sensor?
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Old 10-10-2015
054wheeldrive's Avatar
I am: Kent
Join Date: Apr 2014
Location: SW, WA
Vehicle: 2005 Ranger
Drive Type: 4x4
Engine: 4.0
Posts: 36
Total Props: 0
Could be many things.

You can take it to most parts stores and they'll usually run a scan for free. Better yet, pick up a bluetooth OBD2 scanner. I have
this one this one
and it works great. It tells you everything you need to know, including what error code is causing the CEL to stay on.

They are cheaper than a full handheld unit, but I have never used a handheld one so I can't say how they compare feature wise.
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Old 10-11-2015
iTrader: (1)
I am: Ron Dean
Join Date: Jan 2014
Location: Vancouver, BC
Vehicle: 1994 Ford Ranger
Drive Type: 4x4
Engine: 4.0
Posts: 4,727
Total Props: 88
+1 ^^^

Get the code(s), there are a few hundred possible codes, guessing is a waste of time and money.
Also Codes are not specific, do NOT replace parts based on a code number, post it here for advice.
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