a day ago my engine light came on, so i took it to the nearest advance auto place where they checked it and told me that the engine was running too rich on both sides

they told me that they could not tell me more than that, so i have no clue what to do

they gave me two codes that the computer displayed p0172 and p0175 has anyone had this problem before? any help would be appreciated thanks...

 

There are fewer reasons to run rich than to run lean. A couple of things to check could be a dirty MAF sensor or possible lazy oxygen sensors. If you have a K&N or other oiled element filter, the dirty MAF is a good bet. It is not a common problem but high fuel pressure could do it too.

 

yes i do have an after market air filter ill go check out my maf sensor in the morning

 

by saying high fuel pressure what exactly do you mean?

 

Check out obd-codes.com, they have a pretty good summary of whats going on and how you might go about fixing it.

 

k thanks ill go do that right now

 

I mean out of spec, in your truck's case, greater than about 65PSI. This is probably not one of the things you want to check first because it requires a special pressure gauge/fitting to check it and the regulator that controls the pressure is inside the fuel tank. Like I said, it's possible but not likely that high fuel pressure is causing these codes.

 

ah ok, thanks im hoping that it will be just my air sensor, i haven't cleaned my filter in a while and i never cleaned the sensor

 

well i took my maf sensor off and cleaned it with a q-tip and some warm water yet my light is still on anything else i can do to try to solve the problem?

 

I think electrical cleaner or MAF cleaner works better.

 

when my check engine light came on, i went to a auto parts store and they told me the 4x4 low switch was malfunctioning and i was like wtf im 2wd!!!??

 

lol nice what did they say to that

 

all they said was "im just reading it off here, i have no idea". i was like geez your were a big waste of time, thanks

 

Normally a contaminated (dirty) MAF sensor will cause a lean condition, not a rich condition. This is due to a dirty MAF sensor measuring a lower air flow than is actually flowing, which causes the PCM to reduce fuel (smaller injector pulse width).

 

that makes sense, so what are my options? take it to the dealer?

 

Just one other thought.....check to see if your engine coolant temp sensor is properly connected. If it opens up, it will cause a rich condition.....

 

sorry for a stupid question but where is it located?

 

Mine is a 2-wire sensor next to the thermostat housing on my 1999 (see picture below). I've heard it might be different on the newer 3.0Ls......we need Bob's help
on this for an '02:

 

thanks a lot very helpful ill go see if it is the problem

 

i found the sensor it seems to be in the same location , it was plugged in there good, but just to make sure i disconnected and reconnected it, yet it failed to resolve the problem

 

can you use throttle body cleaner for the MAF?

 

no, you need electrical cleaner.

good job on searching, you found a 4 year old thread lol

 

haha yea i was searching through and just been reading every thread i come across.

 

yes you can bro. CRC makes air intake cleaner. its non chlorinated so it will not harm your MAF just dont blast it too close cuz the pressure could bend/snap your wires. yes you can jut use CRC.

now let this thread die another death haha

 

thanks man. and thanks for the tip on the pressure too close for the sensor. i took my MAF out and someone put the adapter upside down. dont know what exactly to call it but its the part that the air filter connects to which connects to the heat blocker which then connects to the MAF. but yea ima clean that out today...thank you