This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic.
The power control module uses that information to regulate the amount of fuel that is released into the engine. The goal of which, is to maintain the proper ratio of air and fuel. When the oxygen sensor is working properly, it will rapidly switch from high voltage rich exhaust to low voltage lean exhaust. The Check Engine light will come on and depending on the vehicle type, rich or lean codes may be present in addition to the P trouble code.
Inspects the wires leading to the oxygen sensor and checks for any broken wires or exposed wires, these should be repaired or replaced as necessary. The oxygen sensor will also need to be replaced if so. Inspects the exhaust around the oxygen sensor and checks for holes, as this will cause an improper reading from the oxygen sensor. Next, the mechanic uses an OBD-II scanner to see if the sensor voltages are switching properly by viewing the live data.
If they are not switching properly, the oxygen sensor will need to be replaced. If they observe that the sensor voltages are switching properly, this is an indication that there is an intermittent problem with the oxygen sensor.
It is common for there to be an intermittent problem with the wires leading to the sensor as well. While viewing the live data, checks for a slow or no response from the oxygen sensor, as this is an indication that the oxygen sensor needs to be replaced.
The most common mistake when diagnosing the P trouble code is replacing the oxygen sensor without first inspecting the other components of the system. It is important to check for holes in the exhaust near the location of the oxygen sensor, air leaks in the intake, and oil and or water saturation at the connector. All of these components should be inspected before changing the oxygen sensor.
This code is considered to be serious because of the way it affects the drivability of the vehicle. It is also possible for the vehicle to misfire and cut off.
At highway speeds this would be especially dangerous, so it is a problem that should be addressed immediately. It is very common for the oxygen sensor to cease in the exhaust pipe.
If this happens it will be necessary to have an oxygen sensor removal tool as well as a heating element to complete this repair properly. A propane torch works well as the heating agent for this repair.
P0154 MERCEDES-BENZ - O2 Sensor Circuit No Activity Detected Bank 2 Sensor 1
An oxygen sensor set can be purchased from any auto part store and many auto part stores rent this set as well. YourMechanic offers certified mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at With YourMechanic you can skip the auto shop altogether. They send certified and screened mechanics straight to your door and enable you to save big on car repair and maintenance.
Cost of diagnosing the P code. No more waiting rooms! Our mechanics will come to you to diagnose and fix the P code. Recent Check Engine Light is on Inspection reviews. Excellent Rating.We recommend Torque Pro. Oxygen sensors play a critical role in the fuel, ignition timing, and valve timing strategies calculated by the PCM.
In practical terms then, if the primary sensor oxygen sensor 1 does not generate a signal voltage because it is inactive, the PCM is deprived of the information it needs to manage the engine effectively. On most applications, the PCM provides a baseline signal voltage of around millivolts when the sensor is cold. As the heater control circuit warms up the sensor element to bring the sensor into operation sooner, the resistance which is generally about 8 Ohms starts to drop, which allows the sensor to generate signal voltages that are based on the amount of oxygen in the exhaust stream.
If the PCM detects that it takes longer than about 60 seconds or so for the sensor element to heat up, or that the signal voltage does not move outside of theto millivolt range, it will deem the oxygen sensor to be inactive, set code P, and trigger the CHECK ENGINE light.Nissan o2 sensor change oxygen sensor Frontier, Pathfinder, Titan, Q56, Armada
Note however that the values given here are guidelines only; consult the manual for the vehicle being worked to get the exact values for that vehicle. This type of sensor is NOT interchangeable with conventional oxygen sensors; consult the relevant manual for the correct diagnostic, testing, and repair procedures that pertain to this type of sensor. The panel below illustrates some of the causes of P that are not related to wiring, or other electrical issues.
Damage to wiring in the heater control circuit that could influence the time it takes a sensor to reach working temperature — about 0 C. Blown fuse s in the heater control circuit where applicable that prevents the element from heating up. Failed, or failing PCM. Note that this is a rare event, and the fault must be sought elsewhere before any controller is replaced. On the other hand, some symptoms may be so severe on other applications that the vehicle becomes undriveable; also be aware that the severity of one or more symptoms may vary between vehicles.
Possible symptoms include the following. NOTE 2: Before attempting an electrical diagnosis of code P, make sure the engine is in good running condition, and that no vacuum- or serious exhaust leaks are present that could influence the operation of oxygen sensors. Also, make sure there are no rich- or lean running conditions, and that the engine oil is not contaminated with antifreeze.
If any other codes are present along with P, resolve these issues first before trying to diagnose P NOTE 3: In a properly functioning oxygen sensor, any change in the throttle setting will produce an almost immediate change in the signal voltage; however, the speed at which the changes occur as a function of sensor efficiency can best be judged with the use of an oscilloscope.
Bear in mind though that while an oscilloscope can identify incipient problems, the interpretation of waveforms produced on oscilloscopes requires expert knowledge and verified reference data for each application being tested.Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. What does this mean? The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type.
The voltage from the sensor is constantly approx. P Mercedes-benz Description The front heated oxygen sensor or O2 sensor 1 is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions.
The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V. Get Access to Factory Service Manuals. Need more help? Get the P Mercedes-benz code diagnosed by a professional: Find a repair shop in your area.
Related Information. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P Mercedes-benz code? Have you replaced any parts? Any information is appreciated.
Repair Importance Level: 2. Why is the Engine Light ON? Home - About AutoCodes. Posted and Edit by AutoCodes.This code appears when the PCM powertrain control module, also known as ECM or engine control module in other brands remains at or close the 0. The PCM then uses this information to regulate the fuel in the engine and keep a good air fuel ratio as it regulates the amount of fuel released to the engine.
The other two wires are for the heater element of the O2 sensor, and it works by allowing the sensor to warm up faster, and ultimately get the engine to enter closed loop faster, reducing startup emission.
This heater element is supplied usually with 12V feed from power distribution center and ground.
When the O2 sensor is working properly, it will switch from high voltage rich exhaust to low voltage lean exhaust rapidly 2 to 3 times per second when the engine enters a closed loop. Rich exhaust produces high voltage, while lean produces low. If the O2 sensor fails to switch back and forth as fast as it should be, or for some reason is stuck in either high or low voltagethis will lead the PCM to trigger the Check Engine light and register the Error Code P As said earlier, this code, as with other error codes, will activate the Check Engine light.
And depending on the type of the vehicle, rich or lean codes may also be present aside from P The most common symptoms however, include:. As with most error codes, an OBD-II scanner is required to record all present codes and freeze frame data. After recording the data, you can proceed by checking the wires that leads to the O2 sensor. Look for any signs of broken or exposed wires. These things should be repaired or replaced as necessary. Then, check whether these wires are rubbing against exhaust components, which what usually causes them to fray and break.
From there, check the wiring of both water and oil saturation at the connector. Fix any leaks as necessary. The O2 sensor must also be replaced. Check the exhaust around the O2 sensor and look for holes as these things can lead to improper readings of the O2 sensor. Run the vehicle to take O2 sensor to its operating temperature.
Then, use the OBD-II scanner to see whether the voltages are properly switching through the live data stream. If the sensor voltages are properly switching however, then the problem in the O2 sensor must be intermittent, which suggests a problem in the wires leading to the sensor.
While viewing the live stream data, watch out for slow or no response from the O2 sensor, as this indicates it needs replacement. Repairs are pretty basic and straightforward for this error code. Of course, you need a thorough diagnosis before conducting any repairs. Some of the possible fixes include:. This code obviously affects the drivability of the vehicle; it is dangerous for vehicles to misfire and cut off at highway speed, thus, it is considered as a serious problem and should be fixed ASAP.The PCM then uses this information to regulate fuel into the engine and maintain proper air:fuel ratio.
It usually provides a ground also. The other two wires are dedicated to the oxygen sensor heater element. This heater allows the sensor to warm up faster, which allows the engine to enter closed loop faster, reducing startup emissions. The heater element is supplied a 12v feed from the power distribution center usually and a ground.
The oxygen content of the exhaust affects the O2 sensor resistance. Lean exhaust produces low voltage, while rich exhaust produces high voltage. The oxygen sensor is capable of varying between 0. Once the engine reaches closed loop, the O2 sensor should begin switching rapidly between rich and lean voltages times per second. Then, using the live data function on a scan tool, observe the Bank 2,1 oxygen sensor voltage reading.
Is it switching properly? If so, the problem may be an intermittently bad sensor or more likely a wiring problem. Visually check the O2 sensor wiring and repair as needed.
If so, increase idle speed for 30 seconds or so. If the sensor begins switching after a period of elevated idle, visually check the exhaust for holes or rust near the O2 sensor that could be affecting the voltage reading If the exhaust checks out, suspect the sensor to be sluggish and replace it. If the Bank 2,1 oxygen sensor appears to be not switching, turn the engine off, and unplug the Bank 2,1 oxygen sensor.
Now the voltage reading should be low about 0. If it is, then check for a bad connection at the O2 sensor connector. Repair as necessary. If no bad connection is found, replace the O2 sensor and re-check. Now check for voltage at the O2 sensor signal wire. If it does, check also for a good ground to the sensor as well. Repair as necessary Check for loose connections, water intrusion at PCM connector, etc.
Error Code P0154: O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
If you have no 0. There should be no resistance nor any voltage. Repair excessive resistance. If you still have no 0. It may be necessary to clip the signal wire to eliminate the possibility of a short or open somewhere. It may be the problem. The list of automotive Makes at the right edge of the screen. Enter the 5 character trouble codes in the search box and submit the search.P is a relatively common trouble code.
There can be many reasons for this code to throw. These include a bad o2 sensor, blown heated element fuse, and wiring issues. It uses this data to tune the engine on the fly. P affects Bank 2 Sensor 1. Bank 2 is the side of the engine that has the second piston in the firing order. That means that different model years and engines can have Bank 2 on a different side.
Look up which side of the engine bank 2 is on. Engines that only have one exhaust manifold will only register P when sensor one is not registering any activity. Sensor 1 will be the first sensor in the line. The PCM supplies a voltage or roughly mv to the O2 sensor. As the engine warms up, this voltage is supposed to change. Most of the time, the only symptom of P is going to be the service engine soon light. But, there can be other symptoms.
These include:. There are a lot of different things that can cause P to be thrown in the Silverado. Here is a list of common potential causes for P in general:. There are a lot of issues that can cause P in the Chevy Silverado. If you feel there is anything that you could do to improve or add to this article, please leave a comment below.
These include: Decreased fuel mileage Stalling engine Increased exhaust smell, black color from tail pipe Misfire Chevy Silverado P Causes There are a lot of different things that can cause P to be thrown in the Silverado.
Here is a list of common potential causes for P in general: Wiring — Most of the time, Bank 2 Sensor 1 is not going to be very difficult to get to. Make sure that the pins look good and that the harness is seating well and not cracked. Also check to make sure that the wiring is not frayed or shorted. How to check for a short YouTube. Bad O2 Sensor — The oxygen sensor itself can go bad. This is often the cause of P Exhaust Leak — An exhaust will can cause P You should be able to listen and find it.
Intake Leak — If there is a leak in the intake manifold, it can cause the P How to test an intake manifold knowyourparts.However, an oxygen sensor is easy to replace on many cars and is usually detailed in the owner's manual. If you know where the sensor is, you only have to unclip the old sensor and replace it with a new one. Regardless of how you approach it, you should get this fixed right away. So you should chech it on our car models. Disconnected, dirty or fouled spark plugs are common causes for engines that won't start.
Spark plugs typically need to be replaced every season or 25 hours of use. You should also check that the spark plug gap is set properly. If your spark plugs look good, problems with your ignition system can also preventing a spark. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage. Parts or components should not be replaced with reference to only a P DTC.
The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing. Code Search Please fill the "Code Box" to find engine fault code. Ways to read engine trouble codes. Ways to clear check engine light on car panel.
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Check engine light comes on Engine stalling or misfiring Engine performance issues Car not starting. If one of these reasons for P code is occuring now you should check P repair processes. Now don't ask yourself; What should you do with P code?
The solution is here :. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a cl P code.