P2241 and running rough - any experience?

Hi there,

2005 DC V8 here, got a check engine light yesterday. OBD2 reading received a P2241 code, which I think is for an oxygen sensor. Thought of fixing that myself.

Today though the truck started running rough and I briefly got a flashing check engine light.

Thinking of taking it to a shop now and was wondering if any of you have ever run into something like this?

Any advice how severe it could be? Could it just be running rough because the sensor went out?

Any thought is appreciated.

 

Flashing check engine light is usually a misfire. What is the condition of your ignition coils? Brand? Pics of ignition coils? Misfire on these trucks is usually an easy fix.

Your 2241 is usually a O2 sensor yes. Probably best to go ahead and replace all of them with Denso sensors.

 

Specifically, passenger side sensor between exhaust manifold and cat. It could be the sensor is shot (not unheard of), or the wiring is damaged. But if you're replacing one, it's best to replace both on that side, the pre-cat and post-cat. Use OEM (Denso brand), you don't want to go with aftermarket/3rd party on these.

Before digging more into diagnostics, replace the O2 sensors on that side. Then clear codes (or just leave neg batt cable off for 10-15min). Expect the truck to potentially run a little awkward after as it re-learns with the new sensor.

If new codes popup, let us know. If not, let us know that too

 

PS - Denso part numbers
234-9051 (Upstream)
234-4260 (Downstream)

RockAuto has both here: https://www.rockauto.com/en/catalog...03,exhaust+&+emission,oxygen+(o2)+sensor,5132

Members get 5% discount.

Again, I wouldn't buy off-brand on this. You may continue throwing codes and end up paying twice.

 

Thanks all for your responses and sorry for the delay in answer.

I've decided to have it checked out by a mechanic and will let you know what they say. Just got the truck and want them to do a look over too.

Coils look good and I hope the sensors will by the only item.

Thanks again!

 

Update:

Glad I took it in. Turns out one of the spark plugs had come loose and some gas was escaping through there affecting one of the coils (didn't check that one...).

Got all new plugs and one new coil now. Should be good now, hopefully.

Thanks again for all your help!

 

Thanks for posting back with what they found. Always interesting to see what kinda stuff mechanics come up with. This is why I don't usually trust anyone else to touch my stuff, loose plug should never happen!

But it also does make some sense. Sometimes you'll get weird responses from upstream O2 sensor if there's unexpected outside air being introduced between the throttle body and the upstream O2. I've had it happen with intake manifold leaks, exhaust manifold leaks. This is a 1st for spark plug/cylinder leak tho!