Mercedes AdBlue DPF And NOX Problem Fix | P229F91 

It’s concerning that the downstream NOx sensor has failed twice, especially since it's been replaced under warranty. The acid smell from the exhaust adds a new layer to the problem, which could indicate an issue beyond the sensor itself. Here's what might be happening and why the dealership might want to run extensive checks: ### Possible Causes of Repeated Sensor Failure: 1. **AdBlue/DEF System Malfunction**: - If the AdBlue system isn’t injecting the correct amount or at the right intervals, it can lead to incomplete neutralization of nitrogen oxides (NOx), causing excessive exhaust emissions and possibly damaging the NOx sensor. The acid smell could be linked to unneutralized exhaust gases, particularly ammonia, which is present in AdBlue and can create a sharp, unpleasant odor if it’s not properly used. 2. **DPF Blockage**: - A blocked Diesel Particulate Filter (DPF) can cause high backpressure in the exhaust system, which might contribute to sensor failure. If the DPF isn’t regenerating properly or is clogged, the exhaust gases might become too rich or contaminated, damaging sensors and potentially causing the acid-like smell. 3. **Catalytic Converter or Exhaust Gas Recirculation (EGR) Issues**: - The catalytic converter or EGR system may be malfunctioning. If the catalytic converter isn’t properly converting harmful gases, the NOx levels can skyrocket, overwhelming the NOx sensor and potentially damaging it. - Acidic smells could also be a sign that the catalytic converter is failing or that exhaust gas is too rich in harmful substances, such as sulfur or ammonia. 4. **Poor Fuel Quality**: - Poor-quality diesel fuel could introduce contaminants into the exhaust system, damaging sensors and leading to abnormal smells. This would affect emissions control components like the NOx sensor and catalytic converter over time. 5. **Software Issues**: - It’s possible the issue isn’t entirely hardware-related. There could be a problem with the engine control unit (ECU) software, mismanaging emissions systems like AdBlue and causing repeated sensor failures. Recalibrating or updating the software might be necessary. ### Why the Dealership is Recommending Extensive Checks: The dealership is likely suggesting these comprehensive tests because the recurring NOx sensor failure points to a more systemic issue, not just a faulty sensor. If upstream problems (like those in the DPF, AdBlue, or catalytic converter) aren’t resolved, simply replacing the sensor won’t fix the underlying cause, leading to the sensor failing again. The acid smell suggests that there could be something off with the emissions system, which might need a more thorough investigation. ### What Should You Do? Here’s what I would recommend, given the situation: 1. **Focus on the AdBlue and DPF Systems First**: - These are the two most likely culprits, given the sensor failures and the acid smell. You could ask the dealership to prioritize tests on these systems rather than going through the entire range of tests they’ve suggested. 2. **Check for AdBlue Crystallization or Injector Blockage**: - Sometimes AdBlue can crystallize and block the injector or related components, leading to improper NOx neutralization. This could explain why the NOx sensor keeps failing. 3. **Consider an Independent Specialist**: - If you’re uncomfortable with the cost of dealership checks, consider taking the car to a Mercedes-Benz specialist who can perform a targeted diagnostic on the DPF and AdBlue systems for a potentially lower price. 4. **Evaluate the Cost vs. Benefit of Diagnostic Tests**: - The £800 diagnostic fee might be steep, but if it uncovers a problem in the emissions system (which can be costly to fix later), it could prevent ongoing sensor replacements and more severe damage down the line. ### Final Thoughts: While it’s frustrating to have repeated sensor failures, the dealership’s suggestion to perform deeper checks might be necessary to get to the root of the issue. If the problem is more complex (like a DPF or AdBlue system malfunction), replacing the sensor alone won’t solve it. In your case, focusing the diagnostics on the DPF, AdBlue system, and catalytic converter should give you a clearer picture of what’s going wrong and avoid more sensor failures. Let me know if you need help understanding the diagnostic steps or further advice!

The cost to fix a Mercedes GLC 220 with an AdBlue DPF and NOx sensor issue, such as the P229F91 fault, can vary depending on the nature of the problem and the garage you choose. Typically, repairs related to the NOx sensor can cost around £300-£800 just for the sensor replacement. In cases where more extensive work is needed, such as cleaning the AdBlue injector or replacing the AdBlue tank, the costs can rise significantly, sometimes up to £1,000 or more​ For example, if the problem involves replacing the AdBlue tank, you could be looking at around £840 plus labor and VAT. Additionally, labor charges for diagnostics and repairs typically range between £75 to £150 per hour It's always a good idea to get a detailed estimate from a certified Mercedes garage or an independent mechanic to know the exact cost for your specific issue.

its depends on the vin numbers,please check with mercedes,sorry

DTC P220F is a diagnostic trouble code related to the exhaust aftertreatment system. It typically indicates an issue with the Reductant System Performance. The "start-stop" light not turning green could be related to this issue, as it may be preventing the engine from entering the start-stop mode. Here are some steps to help you diagnose and potentially resolve the problem: Check the DEF (Diesel Exhaust Fluid) Level: Ensure that the DEF tank is filled with the correct DEF fluid. Low DEF levels can trigger P220F and other related codes. Inspect for DEF Contamination: Contaminated DEF fluid can cause issues with the aftertreatment system. Check for any signs of contamination or foreign substances in the DEF tank. Scan for Additional Fault Codes: Use a diagnostic scanner to check for any other fault codes that might provide additional information about the problem. Check for Exhaust Leaks: Inspect the exhaust system for any leaks, as leaks can disrupt the proper functioning of the aftertreatment system. Inspect Sensors and Wiring: Check the wiring and connectors for the NOx sensor and other relevant sensors in the aftertreatment system. Damaged or corroded wires can lead to sensor issues. Perform a Forced Regeneration: Some vehicles have the capability to perform a forced regeneration of the DPF (Diesel Particulate Filter) and aftertreatment system. Consult your vehicle's manual or a professional mechanic to see if this is an option for your vehicle. Consult a Professional Mechanic: If you cannot identify and resolve the issue on your own, it's advisable to seek the help of a professional mechanic or dealership technician. They will have access to specialized diagnostic tools and can perform more in-depth diagnostics to pinpoint the problem accurately. Remember that diagnosing and repairing issues related to the aftertreatment system can be complex, and it's crucial to address them promptly to ensure the proper functioning of your vehicle and to prevent further damage

wow im impressed you seem to know what your doing most garages i spoke to say it's a nox sensor can you book me in@@sanumotorswithcharlie

Hi there! Thank you so much for subscribing and for your kind words! I'm glad my content has been helpful to you. Regarding the errors you're experiencing with your Mercedes C Class, it sounds like you've already taken some steps to address them by clearing the errors and cleaning the clogged Adblue injector. However, it's concerning that the P229F91 error has reappeared after a relatively short period. Unfortunately, without being able to physically inspect your car, it's challenging to provide a definitive solution. However, based on the errors you've listed, it seems like there could be underlying issues with the Adblue system and NOx sensors. Since you've already cleaned the Adblue injector, it might be worth checking other components of the Adblue system such as the Adblue pump, tank, and lines to ensure they're functioning properly. Additionally, for the U010E87 and U029E02 errors related to communication irregularities with the Adblue control unit and NOx sensors respectively, there may be wiring issues or faults within the control units themselves that need to be addressed. As for your question about swapping the forward and aft sensors, it's possible that could be a temporary workaround, but it's not a guaranteed solution and could potentially cause other issues down the line. If possible, I would recommend consulting with a qualified mechanic or dealership who specializes in Mercedes vehicles. They'll have the expertise and diagnostic tools necessary to pinpoint the exact cause of the errors and recommend the most appropriate course of action. I hope this helps, and I wish you the best of luck in resolving the issues with your car! If you have any further questions, feel free to reach out. Keep me updated on your progress, and again, thank you for your support! Thank You

You're welcome! I'm glad you found the video helpful. The NOx (nitrogen oxide) sensor in your Mercedes-Benz E300 W212 is a critical component of the emissions control system. If it's malfunctioning and causing the check engine light to come on, it's important to address the issue. Cleaning the NOx sensor is not recommended , but sometimes its works. Common causes of a faulty NOx sensor Age and wear: Like all sensors, NOx sensors can deteriorate over time due to exposure to extreme temperatures and contaminants. Contamination: Exposure to certain chemicals or contaminants in the exhaust gases can affect the sensor's performance. Wiring or connector issues: Faulty wiring or poor connections can disrupt the sensor's ability to transmit accurate data to the engine control module (ECM). Exhaust leaks: Leaks in the exhaust system before or after the sensor can introduce excess oxygen or other gases, leading to inaccurate readings. Exposure to extreme temperatures: NOx sensors can be affected by extreme heat or cold, which can lead to failure. Oil or coolant contamination: If there's a leak from the engine or cooling system that allows oil or coolant to mix with the exhaust gases, it can damage the NOx sensor. In most cases, when a NOx sensor is faulty, it's best to replace it with a new sensor designed for your specific vehicle model. This ensures proper functionality and compliance with emission regulations. Additionally, a faulty NOx sensor can impact your vehicle's performance and emissions, so it's essential to address the issue to maintain optimal efficiency and reduce emissions.

@@sanumotorswithcharlie Thank you for your tips and valuable information.

The error code P204FFD typically indicates an issue with the AdBlue system, specifically related to Bank 1. AdBlue is a crucial component in modern diesel vehicles, as it helps to reduce harmful emissions by converting nitrogen oxides (NOx) into harmless nitrogen and water vapor. Here's what you can do to diagnose and potentially fix the issue: Check AdBlue Levels: Ensure that your AdBlue tank is adequately filled. Low AdBlue levels can trigger this fault code. If the level is low, refill the AdBlue tank with fresh AdBlue fluid to the recommended level. Inspect for Leaks: Inspect the AdBlue system components, including hoses, connections, and the AdBlue tank itself, for any signs of leaks or damage. Leaks can cause a drop in pressure or improper AdBlue distribution, leading to system faults. Repair or replace any damaged components as necessary. Test AdBlue Injector: Even though you've cleaned the AdBlue injector, there's a possibility it may not be functioning correctly. Perform a test to ensure that the injector is spraying AdBlue properly. If necessary, replace the injector with a new one. Check NOx Sensor: Since you've already replaced the NOx sensor on Bank 1, ensure that it is installed correctly and functioning properly. Faulty NOx sensor readings can sometimes trigger AdBlue system faults. Reset Fault Codes: After performing any maintenance or repairs, use an OBD-II scanner to clear the fault codes from the vehicle's computer. This will reset the system and allow you to monitor if the issue persists. Professional Diagnosis: If the issue persists after checking the above steps, it may be necessary to seek assistance from a qualified mechanic or dealership. They can perform a more thorough diagnostic scan to pinpoint the exact cause of the fault and recommend appropriate repairs. Remember to consult your vehicle's manual or seek professional assistance if you're unsure about any aspect of the diagnostic or repair process.

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The appearance and disappearance of the engine orange light (often referred to as the check engine light) can sometimes be a bit unpredictable. When the check engine light comes on, it indicates that the car's onboard computer (ECU) has detected a fault in one of the systems or sensors. In your case, it was the NOx (nitrogen oxide) sensor. When the technician erased the diagnostic trouble code (DTC) associated with the NOx sensor fault, the check engine light turned off because the ECU believed the issue had been resolved. However, this doesn't necessarily mean the problem is completely fixed. The NOx sensor plays a crucial role in the emissions control system of your vehicle. If it fails or malfunctions, it can potentially affect your vehicle's emissions performance and overall engine efficiency. Continuing to drive with a faulty sensor may not immediately cause catastrophic damage to your engine, but it's not recommended for the long term. Here are a few things to consider: The light may come back: Sometimes, a sensor issue can be intermittent, and the light may come back after some time. If it does, it's a sign that the problem is ongoing and should be addressed. Emissions and performance: A faulty NOx sensor can affect your vehicle's emissions and fuel efficiency. It may not perform optimally in terms of emissions, and your fuel economy could suffer. Legal requirements: Depending on your location, there may be legal requirements regarding emissions control systems. It's essential to ensure your vehicle complies with local regulations. Warranty: If your vehicle is still under warranty, the sensor replacement may be covered. It's worth checking with your dealership. Long-term damage: While driving with a faulty NOx sensor may not cause immediate engine damage, prolonged use without fixing the issue could potentially lead to other problems down the line, including catalytic converter damage. I recommend contacting your dealership or a trusted mechanic to have the NOx sensor properly diagnosed and replaced if necessary. They can provide you with a more accurate assessment of the sensor's condition and whether it should be replaced. In the meantime, keep an eye on your vehicle's performance and any signs of the check engine light returning. ALSO THIS VIDEO MIGHT BE HELP FOR YOU ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9yFSQ1XEhYo.html

thank You Charlie for quick response and advice, If I understood You correctly, if orange engine light stays off from now on - it may be temporary glitch, and it is safe to drive? but if it turns on again in a few days - i should contact my mechanic to have NOx sensor properly diagnosed and possibly replaced . @@sanumotorswithcharlie

The AdBlue injector on a Mercedes C-Class is typically located in the exhaust system, more specifically in the exhaust pipe, just upstream of the Selective Catalytic Reduction (SCR) catalyst. To be more precise: 1. **Location**: The AdBlue injector is situated along the exhaust line, close to the catalytic converter. For most Mercedes-Benz models, including the C-Class, it is positioned under the car, relatively near the middle or rear, depending on the specific model and year. 2. **Access**: The injector is often covered by underbody panels or shields to protect it from road debris and to streamline the vehicle's aerodynamics. These panels would need to be removed to access the injector for maintenance or inspection. To gain access to the AdBlue injector, you will typically need to: 1. Lift the vehicle safely using a jack and jack stands or a hydraulic lift. 2. Remove the underbody panels or shields by unscrewing the fasteners or clips that hold them in place. 3. Locate the injector along the exhaust line, upstream of the SCR catalyst. Always ensure you follow proper safety procedures when lifting and working under the vehicle. If you're not experienced with vehicle maintenance, it might be best to have a professional mechanic handle the inspection or any work involving the AdBlue system.

@@sanumotorswithcharlie Thanks so much Charly! Keep up the good work!Enjoy your videos

Thanks, for your valuable comments, charity is really difficult, I think if you want to watch real content it is not a hindrance.🙂🤔

Please contact Charlie 07551021029 Thank you

Thank you for subscribe and follow us. I’m assuming it’s c class. There is many ways to check sensors. But easy way to clean adblue sensor. And Swipe NOx sensor, reset warning lights. Use the car and take code again. Then you have a answer

thank you