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My 2019 Raptor with 11,00 miles is at the dealer with a 3rd check engine light since I have owned it. I don't think the fact that this is a Raptor makes it any different than any other F-150 in this case. The code it popped was for an O2 sensor, downstream of the catalytic converter. The first time, the CEL went away on its own after a few days. The second time it stayed on and I brought it to the dealer who then replaced the O2 sensor. This time (3rd time) the dealer said they did some further investigation and spoke with a Ford tech rep. After all that they are replacing the O2 sensor again.
It seems inconceivable to me that a part that is meant to last the life of the vehicle has failed twice in 11k miles. I asked them to check the O2 sensor heater wires and vacuum system based on posts I have read here. They said they did that and found no problems.
Does anyone have any further idea or suggestions? This trip to the dealer has been 3 days in the shop and the first one was 2 days in the shop. I am not that excited about going through this again and wasting my time. I know it can't simply be the sensor and I strongly suspect I am going to be back in the same situation in a month. Any help greatly appreciated.
All I can say is my O2 sensors failed at about 90K. Most likely was a result from a previous stuck fuel injector. You're right, they usually don't fail unless you have a lot of miles. Something seems strange about it on your truck. Best of luck to you.
Do you remember the actual code number they gave you? Was it actually downstream efficiency? A downstream code typically happens when the ecm commands a test....in very broad ungeneralized terms the engine is commanded to run rich and then lean, the upstream O2 sensor is compared to the downstream O2 sensor and if the two waveforms are too close together it indicates the cat is not doing its job. They need to either put it on a sniffer to see if the cat is weak/bad or just go ahead and replace the cat, or do a smoke test on it for exhaust leaks. You are well within the emissions warranty and yes weak fairly new cats happen sometimes.....just ask GM. I have never seen a fresh sensor cure an efficiency code when that's the only code and the engine is otherwise running great but I guess it could happen.
Speaking of O2 sensors... I’m changing my exhaust today and I pulled all 4 sensors. Is it me, or the upstream sensors look exceptionally dirty? Should I attempt to clean them? Or just reinstall? The upstream are the upper 2 in the top pic - and the lower 2 in the bottom pic.
Its a 2016 with 32k miles. I recently started running 93 octane. (5-7 tanks)
Now this is just me and I probably don't worry about saving money as much as I should but if I thought they needed attention I'd go ahead and replace them if they had over 50k miles on them. Besides, I imagine if I tried to clean them....they'd wind up needing replacing anyway....and you've already got the Red Cross involved. You can't really tell what the actual element looks like based on the shell so as long as the orifices aren't clogged up and everything was fine when they came out, they should be fine going back in. There's maintenance, and there's preventive maintenance. I can't make the call.
O2 sensor
