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Discussion Starter · #1 ·
Had the van to the service guys for the check engine light, and this is what it came back as: 174: The oxygen sensor is saying that the system air/fuel mix is far too lean (too much fuel is being added as a correction).

They couldn't find anything other than fuel filler neck being corroded. They suggested replacing that, but that was around $480. So I was wondering if this is a common cause and fix of this particular code. If not, what was the actual issue and how did you fix it?

The O2 sensors are newer, and it took a good month (maybe even two) before the check engine light came on, so I don't think they went bad...

Thanks
 

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The filler neck corrosion won't cause the code 174. If anything, it would cause error codes relating to the EVAP system (which also occur if the filler cap is not fitted correctly)

Code P0174 is bank 2, sensor 1. That is the O2 sensor on the catalyst, so unburnt air could be getting into the exhaust system somewhere.
It's also possible that the catalyst itself is failing.
 

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Another thing to keep in mind is the fuel pump. I got a series of lean codes on my VW over the course of a month or two rather randomly. Then one nice afternoon, I was calling a towtruck.
 

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Another thing to keep in mind is the fuel pump. I got a series of lean codes on my VW over the course of a month or two rather randomly. Then one nice afternoon, I was calling a towtruck.
Yes, I got the same code. My van would stumble and die, then come back alive after sitting for a bit. Shop measured fuel pressure and saw decrease after extended test drive. They replaced the pump and all's been well.
 

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Discussion Starter · #7 ·
Just an update...

So I cleaned the airfilter (K&N) and then cleaned the MAF sensor - which somewhere I saw, somewhere, someone said some of them could leak the silicone out of the pot - I'm guessing that's what was happening to mine, because when I removed it, then looked inside, it looked like it was full of earwax. I sprayed cleaner in it and saw some metal, but when I stuck a long piece of wire in to pull out the remaining "earwax", it seemed to be part of something else below it, like it was stuck on some other strands... Anyway - I figured at that point it was shot, so either way I needed a new one, so I put it back in, and now it starts no problem, but, it won't stay running under 1500 rpms. I'll post back when I get a new one put in...
 

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Discussion Starter · #8 ·
Dang! I did something wrong... I also cleaned the intake and had pull the choke? cables to open the choke to clean out some gunk. The van still starts, but won't idle, no problem if I keep my foot on the gas, but if I take it off, it dies. I look at the cables, and the inner cable, the one closest to the intake, seems a bit lose. I pulled on the lever itself, not the cables, but did I mess these up some how?
 

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Discussion Starter · #9 ·
Never mind, I bent one of the pins on the new MAP sensor - straightened it out, reconnected it and the local auto parts store cleared the error for me (we'll see if it comes back or not), but now it's running like a top!

Thanks again for the help!
 

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Had the van to the service guys for the check engine light, and this is what it came back as: 174: The oxygen sensor is saying that the system air/fuel mix is far too lean (too much fuel is being added as a correction).

They couldn't find anything other than fuel filler neck being corroded. They suggested replacing that, but that was around $480. So I was wondering if this is a common cause and fix of this particular code. If not, what was the actual issue and how did you fix it?

The O2 sensors are newer, and it took a good month (maybe even two) before the check engine light came on, so I don't think they went bad...

Thanks
I am glad you made it! Congrats
Anyway for other with similar problem, there are many possible reasons of check engine light being on, it could be a missing gas ca,faulty oxygen sensor, or misfiring plugs.
 

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In addition to this I also thing $480 is too much high for fuel filler neck replacement
I have a list of estimated prices and brand of this part

03 2003 Ford Escort Fuel Filler Neck - Replacement $49.00
00 2000 Dodge Grand Caravan Fuel Filler Neck - Replacement $132.00
04 2004 Toyota Avalon Fuel Filler Neck - Replacement $123.00
97 1997 Mazda B4000 Fuel Filler Neck - Replacement $52.00

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