Question about 2007 Chevrolet Impala LS Sedan New Cars

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The engine light is on and i need help to take it off. also their is a fuel pressure sensor condition.

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The way to turn off the check engine light is to have the codes scanned and the problem repaired. Todays newer GM vehicles use several different comunication protocals for the different computer systems. The latest scanner technology is needed to scan and clear codes. Just disconnecting the battery does not work anymore.

Posted on Apr 18, 2009


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2002 buick Lasabrea custom service engine soon light code revi ew says multiple misfire detected

Multiple misfires can be caused by a few different things , intake manifold vacuum leaks , low fuel pressure , basic things like plug wires an spark plugs needing to be changed if hasn't been done already . How many miles on the vehicle ? If over 100,000 K timing chain an gear wear can also cause this . The powertrain control module (PCM) uses information from the ignition control (IC) module and the camshaft position (CMP) sensor in order to determine when an engine misfire is occurring. By monitoring the variations in the crankshaft rotation speed for each cylinder the PCM is able to detect individual misfire events. A misfire rate that is high enough can cause the three-way catalytic converter to overheat under certain conditions. The malfunction indicator lamp (MIL) will flash ON and OFF when the conditions for 3-way catalytic converter overheating are present.
If the misfire is random, check for the following conditions:
System grounds

Ensure all connections are clean and properly tightened.

Mass air flow sensor

A mass air flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition. Try operating the vehicle within the Failure Records conditions with the MAF sensor disconnected. If the lean or misfiring condition is not present with the MAF sensor disconnected, replace the Mass Airflow Sensor Replacement .

Damaged accessory drive belt or driven accessory

A damaged serpentine belt or belt driven accessory can cause engine load variations sufficient to set a misfire DTC.

Air induction system

Vacuum leaks that cause intake air to bypass the MAF sensor will cause a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or malfunctioning crankcase ventilation valve, or for vacuum leaks at the throttle body, exhaust gas recirculation (EGR) valve, and intake manifold mounting surfaces.

Fuel pressure

Perform a fuel system pressure test. A malfunctioning fuel pump, a plugged filter, or a malfunctioning fuel system pressure regulator will contribute to a lean condition. Refer to Fuel System Diagnosis .

Fuel injectors

Refer to Fuel Injector Solenoid Coil Test .

Water contamination in the fuel system can cause a single cylinder to misfire as well as cause a random misfire, refer to Alcohol/Contaminants-in-Fuel Diagnosis .

EGR system

Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.

Extended idle

Excessive Open Loop operation caused by extended idling or short trip driving may leave deposits on the heated oxygen sensors. The deposits cause oxygen sensors to respond slowly to exhaust oxygen content, affecting fuel control and causing a misfire to be indicated at idle. This condition is not permanent. To determine if this condition is causing the DTC P0300 to set, review the Freeze Frame/Failure Records for DTC P0300. If the DTC P0300 occurs at high engine speeds, the condition described above did not cause the DTC to set. If the DTC P0300 occurs at idle or very low engine speeds and at engine coolant temperatures below 80?°C (176?°F), the condition described above is very likely the cause of the DTC to set. The deposits on the heated oxygen sensors can be eliminated by operating the vehicle fully warm at mass air flows above 15 g/s.

Jun 23, 2016 | Buick Cars & Trucks

1 Answer

Truck is running rough. Changed intake gasket, brake booster, and put in new spark plugs. Truck runs good for a few miles then it runs rough again. What could this be?

Do you have a check engine light on ? Is it cold when it runs good an then not when it warms up ? You need to have a diagnostic scan tool hooked up , check engine sensor data parameters .Have a pro diagnose it before replacing parts .ECT - engine coolant temp . sensor , mass air flow sensor , O2 sensors , also check fuel trims , if you know what those are . Fuel trims are a good diagnostic tool , is the PCM adding fuel for lean condition ., low fuel pressure ,plugged fuel filter , worn fuel pump etc... Or is the PCM subtracting fuel , leaking fuel injectors , bad fuel pressure regulator . What make , model an year vehicle ?

Dec 23, 2015 | Cars & Trucks

1 Answer

2011 nissan sentra won't start

Thank you you can start by scanning for codes, but a 02 sensor will not cause a no start condition
We will have to pinpoint what the engine is missing.



All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the car to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should! Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition

Nov 16, 2015 | Nissan Sentra Cars & Trucks

2 Answers

Go to you tube and look for how to install fuel pressure regulator.

Jan 11, 2014 | 2005 Ford Focus ZX3

1 Answer

The engine light is staying on.I had a Domestic done on it at autozone--troubleshooting report PO193.Definition:Fuel rail pressure sensor condition--Explanation:The powertrain control module monitors the...

try changing your fuel filter it may solve your problem. after changeing fuel filter disconnect battery for 30 minutes if your light stays off problem solved.if this was helpful please leave me good feedback

Apr 12, 2013 | 2004 Ford Freestar

1 Answer

Black smoke and high gas comsumption

This sure sounds like a "rich" condition. Meaning the engine is receiving too much fuel from the fuel injection system or the carburetor, depending what type of fuel delivery system you have and the year of the vehicle. A rich condition most always causes excess carbon (black smoke) and high gas consumption. A common cause of this on later model vehicles with fuel injection is a bad fuel pressure regulator allowing too much fuel to enter the throttle body. Many pressure regulators are connected directly to the fuel rail running along the topside of the engine. It's about 2-3 inchs round and has a vacuum port on top of it. If it is easliy accessable, pull the vacuum hose off of it and see if the engine idle speed stays the same, also check for any unwanted fuel inside the vacuum hose. If those 2 conditions exsist, chances are you have a bad fuel regulator.

Carbureted vehicles are another story. They have a float and a needle & seat assembly inside which sometimes get stuck or dirty, allowing too much fuel to enter the engine. Both of these parts are deep inside carburetor and are best left to a professional technician to diagnose. One last thought. A bad oxygen sensor (O2 sensor) will sometimes cause a rich condition. But if an O2 sensor goes bad, it is usually accompanied by a "check engine" light coming on.
If your check engine light is not on, it's probably is not the sensor. Hope this helps some, good luck..

Sep 29, 2011 | Cars & Trucks

2 Answers

My truck is showing codes 171 and 174. Can you help

P0174 Generic Definition

Fuel Trim Bank Two Condition
- The ECM has detected a rich or lean air/fuel ratio condition on engine bank two

Probable Cause[s]

  1. If bank one and two are set together suspect a fuel pressure condition or MAF sensor fault
  2. Failed HO2S21
  3. Ignition misfire condition
  4. Fuel injector problem
  5. Engine mechanical condition

    P0171 Generic Definition

    Fuel trim bank one condition
    - The powertrain control module uses the oxygen sensor to calculate the air/fuel ratio of the engine. The computer has recognized a rich or lean condition on one engine bank only.

    Probable Cause[s]

    1. If bank one and two codes set together suspect fuel pressure or MAF (Mass Air Flow) Sensor
    2. Oxygen sensor defective
    3. Ignition misfire-repair
    4. Fuel injector problem

      Mar 05, 2011 | 1999 Chevrolet Silverado 1500

      1 Answer

      SES light on code P0171, 2005 Xterra, what to do??

      P0171 is a lean oxygen sensor code for bank 1 on your engine.
      It indicates that there is a lean condition (engine not getting enough
      fuel or getting too much air) on that side of your engine.
      Bank 1 is always the side of the engine where #1 cylinder is
      located. In your case it is front-most cylinder on the right side
      of the engine. (As viewed from the driver's seat)
      So bank one is the passenger side.

      If there are any other engine control codes, you need to fix those
      first, as they may be the cause of the lean condition.

      If that is the only code you are getting, then diagnostic testing
      needs to be performed to determine the actual cause of the problem.

      Possible causes are:

      * Intake air / vacuum leaks
      * Faulty / dirty fuel injector(s)
      * Incorrect fuel pressure (Likely to cause both P0171 and P0174 at the same time)
      * Low fuel volume (Pressure OK) (restricted fuel filter,etc.)
      * Fauly Mass Airflow Sensor
      * incorrect PCV hose connection
      * Exhaust gas leaks
      * Faulty Air Fuel Ratio Sensor

      Dec 01, 2010 | 2005 Nissan Xterra

      2 Answers

      No power with a 5.4 liter

      P0171 and P0174 is a lean condition in your air/fuel ratio. This is common to a dirty MAF, IAT Sensor. You can buy a can of MAF sensor cleaner at Auto Zone or any other large auto parts store and just follow the instruction on the can. IF the reading from the MAF and IAT sensor's are incorrect, the PCM is thinking that the engine is getting to much gas so it's leaning the air/fule mixture out to much and your getting the dtc code for a lean mixture in your engine. That is causing you the lack of power since your not getting the right amount of air/fuel ratio in your engine which should be 14.7:1, anything more then that will be at a lean condition and prone to knocking (detonation) or miss fire. Good luck and hope this helps. keep me posted. be glad to help

      Jun 08, 2009 | 2006 Ford F 350 Super Duty

      2 Answers

      Car turns over but won't crank?

      you might have a bad manifold absolute pressure (map) sensor. it's on the intake manifold, it weighs the air that comes in the intake (weird huh) and if it goes bad it reports a condition that doesn't really exist to the computer that controls engine functions. if you unplug the sensor and then the engine starts, you got a bad sensor. the engine computer will set a code and the check engine light will come on, but you can replace the sensor and have the code cleared. if you unplug the sensor and the car still won't start, it's not that sensor. hope that helps. failure of this sensor will definitely cause a no start condition.

      May 26, 2009 | 2003 Oldsmobile Alero

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