Engine Codes Options

[zadam123]

I had my service engine soon light on so i took the 2001 montero limited to autozone and had the codes read i got

p0171 and p0174

171 reads .............

system to lean cylinders 1 - 4
causes are

ignition system faulty
fuel system faulty - injectors or pressure
vacum leak
engine mechanical conditon

174 reads.............

system too lean cylinders 2-3
causes are

ignition system faulty
fuel system faulty - injectors or pressure
vacum leak
engine mechanical conditon

does anyone konw what this actually means. or what the most common problem is?


also does anyone know where i can DL the 2001 montero limited manual?

thnks

[tj90]

Go to alldatadiy.com and get a subscription. Worth its weight in gold. Sounds like you have a vacuum leak somewhere causing a lean condition.

[SRSONE]

heres a tt article





If the check engine light illuminates and the PCM stores DTC P0171/174, check the following;


1.Freeze Frame Data. Does the freeze frame data indicate a long fuel-trim (LFT1 or LFT2) in the high percentage range of 5% - 12.5%? This high percentage could indicated a lean condition. Check the following:

Vacuum leaks (loose hoses, bad brake booster diaphragm, damaged injector O-ring, etc.)

Fuel pressure regulator for low fuel pressure.

Leaking exhaust manifold gasket(s).

2.Fuel Type. Some areas of the country use fuels blended with ethanol. The amount used can have some impact on the oxygen concentrations in the exhaust system, which can affect the PCM's O2 readings. If a customer is using fuel with ethanol, MMNA recommends that they change to another type of fuel to see if the condition improves

[zadam123]

Forgot to mention I have a missing front wheel abs sensor , could this activate these codes?

ps does anyone know where i can get one for less than the 300 that the dealer is charging?