Service engine warning, MAF code and O2 sensor code, along with check suspension light are turned on
My car has an O2 sensor code on, MAF code as well as service engine warning. I had the sensor fixed. Also, I had the emissions tested along with the replacement of serpentine belts. The check suspension light is on occasionally. The car is very loud usually while idling. After all the checkups, the O2 sensor code is still on, the check engine light is on as well as the MAF code. Please advise me what to do next.
Experienced mechanics share their insights in answering this question :
Hello, it sounds like you have quite a few things going on. I am going to do my best to break them down for you.
First if the engine is very loud when idling and the belt has already been replaced, there may be an issue with the tensioner or idler pulley.
Next, the Navigator is known for needing service to the air suspension system as it gets up in miles, the most common causes of these are the air struts themselves have failed, or one of the air lines has a leak.
Lastly, if the O2 sensor and MAF are continually coming back after the sensors have been replaced, the most common cause would be either an exhaust leak or a vacuum leak.
Qualified technicians such as the ones at YourMechanic will be able to diagnose these issues and recommend the best path to repair, starting with a diagnosis of your warning lights.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
A faulty mass airflow sensor is a common reason why a check engine light comes on. If the engine control module receives a MAF error code, it will turn on the check engine light to let you know that there is a problem with the engine.
The MAF sensor malfunctioning can also cause your car to throw a check engine light (CEL). Furthermore, it can cause different check engine codes such as the O2 sensor, “low air volume”, or something else.
The mass air flow (MAF) sensor measures the amount of air entering the engine. Check engine light code P0101 is set when the measurement of air entering the engine by the mass air flow sensor is outside of the manufacturer`s specified range.
Mounted in the air intake duct or air filter housing, a MAF sensor detects the air density as it heads into the engine intake to be mixed with fuel, noted autoguru.com.au. On the other hand, the oxygen sensor monitors how much unburned oxygen is present in the exhaust as exhaust exits the engine.
After Installation of the new MAF:
But if the motor continues to have problems, run the engine idle for 20-30 minutes. 2. You can reset the ECU by disconnecting the battery for 10 min.
Cleaning the MAF as part of regular routine maintenance can help reduce and/or prevent these problems. If the MAF sensor is at fault, cleaning it can help, and many times, even solve the problem. This can be done at home. You just need to remove the component, clean it, and reattach it to your engine air intake system.
The air filter may be the MAF sensor`s first line of defense via the engine`s air intake system, but a clogged, low quality or dirty air filter can actually become the source of MAF sensor damage if any contamination bypasses it.
Not all makes and models of cars will need the ECU reset after replacing the MAF sensor, but the majority will. Do you have to reset a mass air flow sensor? Yes, disconnecting the battery for around 10 to 15 minutes is an important step to take after replacing the MAF sensor to ensure that the sensor resets.
Even a dirty MAF sensor can cause a lean code and/or misfire to occur. The engine may be stalling because it isn`t getting enough throttle opening.
The oxygen or lambda sensor is one of the most important and one of the most misunderstood components of a modern fuel injection system.
Can I reset my ECU using an OBD2 scanner? No. An OBD2 scanner can only be used to detect error codes on your car. It cannot perform tasks like an ECU reset or any modifications on your car.
Check the MAF sensor and clean it out with dry air. Then put it on and disconnect the battery for 12 minutes and hook it up. This will clear the computer to want to relearn itself. Then drive the vehicle and see what happens.
Stalling, jerking, or hesitation during acceleration A bad MAF sensor can cause too much fuel to be left in the combustion chamber, creating untimed detonations. You`ll experience this as poor drivability such as hesitations or sudden jerking motions, particularly during acceleration.
A bad MAF sensor can cause your vehicle to experience poor drivability issues such as engine stalling, jerking or hesitation during acceleration. This could happen while speeding up on the highway on-ramp or cruising down a city street. These issues can create dangerous situations causing accidents and injury.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
Service engine warning, MAF code and O2 sensor code, along with check suspension light are turned on
ANSWER : Hello, it sounds like you have quite a few things going on. I am going to do my best to break them down for you.
First if the engine is very loud when idling and the belt has already been replaced, there may be an issue with the tensioner or idler pulley.
Next, the Navigator is known for needing service to the air suspension system as it gets up in miles, the most common causes of these are the air struts themselves have failed, or one of the air lines has a leak.
Lastly, if the O2 sensor and MAF are continually coming back after the sensors have been replaced, the most common cause would be either an exhaust leak or a vacuum leak.
Qualified technicians such as the ones at YourMechanic will be able to diagnose these issues and recommend the best path to repair, starting with a diagnosis of your warning lights.
check engine light O2 sensor already replaced same codes still popping up after replacing old O2 sensor
ANSWER : Hi there. What you received from the parts store was a code retrieval, not a diagnostic. The codes are set when a fault is detected against normal operating parameter. The computer does not know what caused the fault, only that the fault meets the criteria for this code to set. There could be a problem in the wire harness, converter, or the ECM. The code and data are needed to properly assess the direction that a diagnosis needs. I strongly suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with a check engine light inspection.
O2 sensors changed, but check engine light still showing code after clearing it I checked fuse. Wires are good and used Denso OE.
ANSWER : Depending on what the code was for will determine if the oxygen sensor was to be replaced. If the conditions were for a rich or lean mixture and it said oxygen sensor, then the spark plugs and wires could need replaced if its a rich reading or the fuel injectors could be clogged or not working if its a lean mixture. If the code said that the oxygen sensor was bad, then check the harness and see if there is a break in the wiring or a short to ground in the wiring from the oxygen sensor to the main harness. If you need further assistance with your check engine light being on, then seek out a professional, such as one from Your Mechanic, to help you.
Diagnostic code read o2 sensor bad, replaced o2 sensor, cleared code but engine light came back on, is it caused by bad air filter
ANSWER : Hello there. Typically jump starting a vehicle doesn’t trigger an OBD-II error code. However, one of the most common misdiagnosis issues with the P-2270 is replacing the O2 sensor before diagnosing if there are any exhaust leaks. Obviously, you’ll want to check for the exhaust leaks first, repair the damaged component, and then clear the codes before scanning the vehicle again. Sometimes the electrical harness attached to the O2 sensor is damaged or dirty which will also trigger this error code. The noise and vibration may be an indicator of a loose exhaust pipe, which may be the source of the error code staying on. If you need any help, have a technician from YourMechanic come to your home or office to diagnose your Check Engine Light and make the necessary repairs.
While driving on freeway truck goes into a limp mode, and the check engine light, abs light, parking break light, service brake
ANSWER : It is possible that you could be having an issue with your powertrain control module. This is somewhat of a common problem on many GM vehicles. I would recommend having your vehicle inspected by the dealership to determine if the powertrain control module is functioning properly. If not, a reflash of the powertrain control module may resolve the issue but often times it must be replaced.
2006 Ford Mustang has check engine light on
ANSWER : There are countless potential causes for your illuminated check engine light. The mechanic manually turned off the light, but it came back on because the problem has not been fixed. The first place to start is retrieval of the stored diagnostic trouble codes (DTCs). These codes serve as a starting point for any further diagnostics a mechanic may perform. Codes will be stored anytime the check engine light is on. Since the first mechanic was unable to fix your concern, I recommend giving the professionals at YourMechanic a call. We offer expert check engine light diagnosis and repair.
2010 Toyota Prius. When I made a sharp turn, all check engine and warning lights to check ‘Hybrid System’ came on.
ANSWER : In order to reset the Maintenance Schedule light:
1) Without touching Brake pedal, press "Start" button twice,
2) Press and hold the "STRIP" button until you see "TRIP A" on display,
3) Turn Ignition to "OFF",
4) Press and hold "ODO Reset" button, AND,
5) Continue to hold ODO Reset Press "START" button twice (w/o touching the Brake pedal),
6) Continue to hold ODO Reset until "000000 Miles" appears on display, and Maintenance Light turns off.
A certified YourMechanic technician can also come to your location to help perform an inspection of your vehicle to diagnose your issues with uphill acceleration and recommend any necessary repairs.
Replaced my upstream O2 sensor. The check engine light won’t turn off.
ANSWER : When an error code is triggered and stored in the ECU, it needs to be removed by a professional mechanic using a digital scanner; and not a simple code reader. The folks at Auto Zone use the code reader and are not able to clear codes correctly in most cases. However, it is possible that a different code is stored in the ECU, as more than 100 individual codes can trigger the check engine light to illuminate on the dash. I would recommend having one of our professional mobile mechanics come to your location to complete a check engine light inspection; so they can clear the old codes and determine if other faults are found.
