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Originally Posted by mruck
I can't fix the van myself I am clueless about stuff like this. I did read up on the codes and seems like the price can vary. I thought the ABS light was going to be the most expensive thing to fix. I was quoted $1000 for just the ABS. Does this seem high?
I've called some other mechanics and one told me that the P0171/P0174 code might be fixable with a tune up and replacing the fuel filter. Does this sound like a possibility or not really? He's willing to try other things before resorting to an expensive repair. He hasn't seen the van yet, but it is running fine -- no engine troubles or sounds, etc. The light has been on for several months, but I don't put many miles on it.
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By all means the 171/174 should be diagnosed a bit more before jumping into the isolator bolt fix. The 171/174 codes indicate a lean condition on both banks. This is caused by an incorrect air fuel ratio and can be caused by intake leaks, low fuel pressure, incorrect MAF readings among other items. A clogged filter can affect the fuel flow and could very well cause the problem.