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Discussion Starter · #1 ·
For the past several months I have been getting a constant check engine light code on my 97 F-350 with a 7.5l. The code was 174 which is the passenger side O2 sensor unable to switch. This means the engine is running lean.

I changed out the O2 sensor and the code came back. I had the truck in the shop a few times and no one could figure out the problem. I also asked here on the forum. All suggestions were good but none hit the target.

Finally, after several months it is fixed. The problem was a clogged MAF sensor. This kept throwing the code 174. If anyone is having a similar problem, I would suggest looking for anything which will restrict air and or fuel.

Thanks for all the help!
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