I have a 2000 F-150, V6, with 140,000 miles. The "Service Engine Soon" light came on yesterday with the following codes:

P0135
P0141
P0155
P0161
P0340
P0443
P1409
P1451

I was surprised by the number of codes. Any suggestions on where I should start looking?

Thanks
Sam

 

A little more history would be good. "I have a truck" doesn't tell much about condition.

The first four are O2 sensor related. The fifth one is the scary one, camshaft position sensor. These engines are known to have the synchronizers fail, seize up, and destroy the oil pump gear.

It could be mechanical, related to the sensor, or it could be wiring. Have you heard any squealing or chirping from the engine?

https://www.obd-codes.com/p0340

https://youtu.be/t-Oq6SJZ8OE

 

Something weird with the site, not taking the video links.

 

I appreciate the quick replies. As far as history, the light only came on yesterday, but I haven't noticed any changes at all. No noises, no power loss, only change is that the service light came on. The trucks driving the same as it has for the last 22 years.

The only thing I have done recently was replace the battery a few days ago.

Thanks again

 

22 years is history. Apparently you bought it new but don't drive it much.

The P0340 code is actually for the sensor which sits on top of the synchronizer. All of your codes could be related to chewed wiring, I think. The fact that they all showed up at once makes a person think a mouse has created a new home. I'd check the wiring. Might also be a bad ground point somewhere, especially if you're in the salty part of the country. The camshaft position is very important for engine performance. That's the big one. Changing O2 sensors won't fix that.

That obd-code.com link above is a good one for understanding what each code means. Don't confuse O2 heater circuit with O2 sensor performance. Good luck.

 

I was afraid of that. I hate trying to track down electrical problems.

I bought this thing new when I was in the service. The last 10 years of my career was spent in areas that I couldn't take my truck, so my wife would drive around the block a couple times a week to keep it running. She doesn't like my truck as much as I do.

Thanks again

 

Start with a visual inspection Sometimes things are obvious. Good luck.

 

Check for a blown fuse. Probably F23 under the dash. If blown, it will make the truck behave as if it were in "limp mode".

Pretty common issue. Crap load of "circuit" fault codes for circuits that all run off that single fuse. Usual underlying problem is an O2 Sensor harness got on the exhaust and melted causing a short circuit in the heater circuit.