Code p0174

The engine uses what are called Oor oxygen sensors in the exhaust stream to determine. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. A lean condition will be created if there is too much air, and not enough fuel, in the air fuel ratio (AFR).

The ECM is designed with the capability of adjusting a lean condition back to normal, but only in small to mediocre amounts. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem. The problem is with the rubber grommets in the intake manifold bolts they will crack and cause an intake leak.

Both of these code s reference a number that is given to you when you plug your truck into a OBDII scanner. This means there is incorrect ratio of air and fuel on the car’s engine system, specifically on. L equipped car, pick up, van or SUV. Both are lean codes meaning the Osensors were reading a lean condition. While the air passing through the MAF sensor is metered by the car computer, intake leaks or vacuum leaks are not known.

These sources of additional air increase the air to fuel mixture. A quick way to detect a leak is. Basically this means that an oxygen sensor in bank has detected a lean condition (too much oxygen in the exhaust).

This code is triggered by the first downstream (front) Osensor. If the problem persists the front oxygen (O2) sensor may need to be replaced. The lean condition could be one of several possible causes.

The intake gasket could be leaking, in which case, the intake has to be remove and the gaskets replaced.

I replaced the intake manifold and they still show. Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Step - Un-metered air which enters the intake system of the engine can cause a lean mixture code to be triggere inspect all vacuum lines for cracks or dilapidation. Check the integrity of vacuum hoses at each end of the hose.

In short, lean operation means that there is more air, or oxygen to be more specific, than what is required to burn the specific amount of fuel in the cylinder. It is core DTCs and applied to most manufacturers. A common fault message is assigned to this code. Changed fuel filter and cleaned MAF with a can of spray from an auto parts store for $12. The catch to this is that GM also changed the gasket material to help fix this problem, and they state that the updated ones are supposed to be teal green, and to not use the orange ones again.

This could be due to a failing pump, check valve, Mass Air Flow sensor (MAF – specifically for the secondary air system),. You said you already cleaned it, but a vacuum leak is always the culprit when it comes to these codes. Could be a faulty hose, or an intake gasket. Some mechanics will smoke the car to find the leak. Ford Expedition lean codes could caused by a leaky PCV hose.

Flex fuel engine would throw these codes every time I ran E85. Engine running well except for howling noise comes from the air intake area. Howling has happened in the past but only during winter temps but has always disappeared when the engine warms up. I had the check enginge light checked at Autozone and then I took it ot Car-x to have it looked at. A lean code or codes suggest that there surely is too-much air in the exhaust.

Now includes pictorial instructions on exchanging the transmission fluid in a 4R70W automatic transmission. You may have to register before you can post: click the register link above to proceed. When the Check Engine Light comes on,. Both codes actually point to bank two, which suggests a vacuum leak possibly in the intake manifold gasket to that bank.

I like the ether suggestion circuitsmith made for testing for vacuum leaks. You can confirm the engine is running lean by looking at Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT). Normally, STFT and LTFT should be plus or minus from zero. Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Quickly Diagnose The Most Common Fault on Ford 4. It idles good but when you put it in drive it chugs and sounds like it backfires especially when you give it gas. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing. Watched a video on how to diagnose the MAF sensor, turned car.

The PCM has detected a lean exhaust condition for engine bank 2. The term “lean” is defined as insufficient fuel. There is a Technical service bulletin on this code. Average repair cost is $2at 107miles.

Several possible causes are documented (listed). Still throwing the same codes after the cleaning and resetting. If so, what did they turn out to be.

Those are codes for both banks lean and the thing in common is the intake area and associated parts.

Many of the newer vehicles have an overrev limiter to prevent you from overrevving the engine in Park or Neutral. Dealer said with the after market cold air intake (Halitech) and stock MAF will usaully be the cause of these faults.