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I scanned my Ranger with my new Scangauge II and came up with 3 trouble codes: P0401, U0100, and P0208.
P0401 - EGR Flow Insufficient
U0100 - Lost Communication with ECM/PCM "A"
P0208 - Injector Circuit Malfunction, Cylinder 8
I've scanned it 3 times now, and P0208 and P0401 always come up. I think this is the first time I've seen the U0100 code. What would be the first thing to look for to fix these trouble codes? What are the most common problems with these Rangers, and what parts should be replaced first?.
I don't have 8 cylinders! Why do I keep getting P0208??
P0401 - 95% of the time is a bad DPFE sensor (EGR position sensor). Very quick and easy to replace.. two bolts, a connector, and two small exhaust hoses.
U0100 - I wouldn't worry about this unless it continually comes back.. sometimes the modules have a "brain fart" and lose a packet of data or two, then this code gets stuck in memory for a long long time, only to freak out the first person to scan it.
P0208 - Injector #8? Yes there should be no reason to get this code, obviously. Before jumping to conclusions, run to a local chain parts store as most will scan your codes for free.. keep in mind they'll use a cheap, generic code scanner, but if they come up with something different, there may be a compatibility problem with your Scangauge II. Rare, but it does happen. Also see if there are any software updates available for your Scangauge.
My experience lies with a 2000 2.5L Ranger with an automatic. Singh grooves were added and it was shaved to get compression back to stock. Mileage went up from 23 to 29 mpg and power went up to around 3.0 V6 levels. Here's a pic of that particular head. It doesn't have PowreLynz, PowreRingz, and hasn't been Edged.
According to the 'net, the P0219 is "Engine Over Speed Condition" which means I over-rev'd it down the highway. At what RPM will the ECU trip this code? In other words, what's the redline of my stock '98 Ranger 2.5L 4-cylinder?
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