Audi A4 B9 2.0 TDI NOx Sensor Front (Before DPF) – 8W0907807R Fitment

Check part compatibility by using our vehicle filter options below. If you find your car, this part is compatible.

Maintain precise emissions control and reliable engine performance with this NOx Sensor from D2P Autoparts, designed for the Audi A4 B9 2.0 TDI (2015-onwards) and positioned before the DPF (front NOx sensor). This OEM-compatible nitrogen oxide sensor accurately measures NOx levels in the exhaust stream prior to filtration, supplying real-time data to the ECU and SCR system. Correct NOx readings are essential for efficient combustion, correct AdBlue dosing, and preventing emissions-related warning lights or limp mode.

OEM Number: 0281007857, 0281007858, 0281008749, 8W0907807R, 8W0907807BJ, 8W0907807JJ,

Fitting Position : before soot particulate filter

Placement on the vehicle : Front, Before DPF

Number of pins : 5-pin connector

Connector Shape : oval

Voltage : 12 V

Cable Length : 1,000 mm

Thread Size : M20*1.5

Quantity : 1

Our SKU: TA8W0907807BJ_313
 
All our Nox Sensor For Audi A4 B9 2.0 Tdi 2015-onwards Front Before Dpf 8W0907807R are OEM quality and reliable after market car parts. This Nox Sensor For Audi A4 B9 2.0 Tdi 2015-onwards Front Before Dpf 8W0907807R is specifically compatible with Audi: A4, A4 Allroad, .

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part to your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

Key Benefits

• Accurate Pre-DPF NOx Monitoring – Measures nitrogen oxide levels before the diesel particulate filter to support precise emissions control and SCR operation.

• OEM-Compatible Direct Fit – Designed to match Audi/VW part number 8W0907807R for straightforward installation without modification.

• Restores Emissions System Performance – Helps resolve NOx-related fault codes, SCR warnings and AdBlue system issues.

• Supports Fuel & AdBlue Efficiency – Accurate sensor feedback enables optimal dosing and combustion strategy.

• Durable, Heat-Resistant Design – Built to withstand extreme exhaust temperatures and harsh operating conditions.

• Cost-Effective Aftermarket Solution – Premium quality performance at a competitive price compared with dealer parts.

Frequently Asked Questions (FAQs)

Q: What does a front (before DPF) NOx sensor do?
A: The front NOx sensor measures nitrogen oxide levels upstream of the DPF and SCR system. This data allows the ECU to calculate exhaust treatment needs and control AdBlue injection accurately.

Q: Which vehicles is this NOx sensor compatible with?
This sensor is designed for Audi A4 B9 2.0 TDI diesel models from 2015 onwards that use part number 8W0907807R. Always confirm fitment using your VIN or existing sensor number.

Q: What symptoms indicate a faulty NOx sensor?
Common signs include check-engine or emissions warning lights, increased AdBlue consumption, reduced engine performance, failed emissions tests, or the vehicle entering limp mode.

Q: Is this sensor brand new?
Yes — this is a brand-new, OEM-quality aftermarket NOx sensor supplied by D2P Autoparts.

Q: Is professional installation recommended?
Yes. NOx sensors are part of the exhaust after-treatment system; professional installation ensures correct positioning, wiring integrity and system calibration.

Q: Does this product include a warranty?
Yes — all D2P Autoparts products come with a manufacturer warranty for peace of mind.

1. Standard Shipping (Free) - Please allow 1-3 days for your order to be delivered 
2. DPD Next Day (£4.99) - Please place orders between Monday - Thursday before 4 PM UK time. This service applies to UK Mainland orders only.
3. Royal Mail Special Special Saturday Delivery (£19) - Please place orders between Monday - Friday before 3 PM UK time. 
4. International - Rates vary based on product size. Please enquire for further details. 

We do not provide any guarantees on shipping times, as we are reliant on 3rd parties. However, we strive to ensure that our customers are always satisfied.

All products are protected by a upto 10 year worry-free warranty depending on Part 

Warranty Coverage: Eligibility: To be eligible for 10-year warranty coverage, the car part must be fitted by a certified professional mechanic. Proof of fitment, including the mechanic's certification, must be submitted to Amesplan LTD within 30 days of the part's purchase date. Please send supporting documentation to us via email.In case a purchased product becomes faulty during its warranty period, for reasons unrelated to your acts, omissions or misuse of the goods, you must promptly notify us and fill out a warranty claim form. 

Warranty Non-Coverage: We do not have any liability for any defect arising from normal wear & tear, wilful damage, negligence, tampering of the goods, incorrect fitting of the goods by you and/or a third party. We are also not liable for any abnormal working conditions, alteration or repair of the goods or a failure to follow goods manufacturers' instructions (whether oral or in writing) 

We have a 180-day return policy, which means you have 180 days after receiving your item to request a return. 

To be eligible for a return, your item must be in the same condition that you received it, unused, and in its original packaging. You will also need the receipt or proof of purchase. 

For All Return buyers pay Return Postage.Returns will only be processed after we receive the approved part and a member of our team fully inspects the returned item & successfully matches the returned part to the return reason. 

For All UK orders, we offer free return. We do not offer any reimbursement of shipping costs for Any orders on original sale like Next Day Postage. 

For All Outside UK order  We do not offer any reimbursement of shipping costs for Any orders on either the original sale or the return. 

Please direct all questions to sales@d2pautoparts.com. 

Damages and issues 
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exchanges 

The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

Refunds 
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund.