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The Pair of NOx (Nitrogen Oxide) Sensors is a complete emissions sensor set for diesel-powered Vauxhall/Opel Cascada W13 and Insignia (Mk1 G09 / Mk2 Z18) vehicles equipped with 2.0 CDTi diesel engines. NOx sensors are integral to modern diesel emissions control systems: they measure the concentration of nitrogen oxides in the exhaust both before and after the Selective Catalytic Reduction (SCR) system, providing crucial feedback to the vehicle’s ECU to optimise combustion, regulate AdBlue dosing and reduce harmful NOx emissions. Supplying both sensors as a matched pair ensures full system accuracy and compliance with emissions standards.

OEM Number: 553101, 855606, 855607, 899207, 928221, 928231, 7557090, 55500320, 55589456, 55589458, 70680401, 70680405
 
Placement on Vehicle : Rear, Post Car, Position 2, After CAT, After SCR Catalytic Converter

Operating Mode : Electric

Voltage : 12V

Cable Length : Approx. 390 mm

Number of Pins : 6 Pin Connector

Number of Mounting Bores : 2

Length : Approx. 600 mm

Thread Size : M20

Connector Shape : Oval Bore

Diameter : 8.3 mm

External Thread Size : M20 x 1,5

Spanner Size : 22

Quantity : 1

Make	Model	Variant	Type	Engine	Chassis	Year
Opel	Cascada	Diesel Convertible	2.0 CDTi	1956cc 125KW 170HP B 20 DTH	FWD -- W13	2015-2018
Opel	Insignia	Diesel Estate	2.0 CDTi	1956cc 125KW 170HP B 20 DTH	FWD A G09	2014-2017
Opel	Insignia	Diesel Estate	2.0 CDTi	1956cc 125KW 170HP B 20 DTH	FWD A G09	2014-2016
Opel	Insignia	Diesel Estate	2.0 CDTi	1956cc 125KW 170HP B 20 DTH;D 20 DTH	FWD B Z18	2017-2024
Opel	Insignia	Diesel Estate	2.0 CDTi	1956cc 125KW 170HP D 20 DTH	FWD B Z18	2017-2024
Opel	Insignia	Diesel Estate	2.0 CDTi 4x4	1956cc 125KW 170HP B 20 DTH	AWD A G09	2014-2017
Opel	Insignia	Diesel Estate	2.0 CDTi 4x4	1956cc 125KW 170HP D 20 DTH	AWD B Z18	2017-2024
Opel	Insignia	Diesel Estate	2.0 CDTi 4x4	1956cc 125KW 170HP D 20 DTH	AWD B Z18	2017-2024
Opel	Insignia	Diesel Hatch	2.0 CDTi	1956cc 125KW 170HP B 20 DTH	FWD A G09	2014-2017
Opel	Insignia	Diesel Hatch	2.0 CDTi	1956cc 125KW 170HP B 20 DTH;D 20 DTH	FWD B Z18	2017-2024
Opel	Insignia	Diesel Hatch	2.0 CDTi 4x4	1956cc 125KW 170HP B 20 DTH	AWD A G09	2014-2017
Opel	Insignia	Diesel Hatch	2.0 CDTi 4x4	1956cc 125KW 170HP D 20 DTH	AWD B Z18	2017-2024
Opel	Insignia	Diesel Saloon	2.0 CDTi	1956cc 125KW 170HP B 20 DTH	FWD A G09	2014-2017
Opel	Insignia	Diesel Saloon	2.0 CDTi 4x4	1956cc 125KW 170HP B 20 DTH	AWD A G09	2014-2017
Opel	Zafira Tourer	Diesel MPV	2.0 CDTi	1956cc 125KW 170HP B 20 DTH;D 20 DTH	FWD C P12	2015-2024
Vauxhall	Cascada	Diesel Convertible	2.0 CDTi	1956cc 125KW 170HP B 20 DTH	FWD -- W13	2015-2024
Vauxhall	Insignia	Diesel Estate	2.0 CDTi	1956cc 125KW 170HP B 20 DTH	FWD Mk I (A) G09	2014-2017
Vauxhall	Insignia	Diesel Estate	2.0 CDTi	1956cc 125KW 170HP B 20 DTH	FWD Mk I (A) G09	2014-2017
Vauxhall	Insignia	Diesel Estate	2.0 CDTI 4x4	1956cc 125KW 170HP B 20 DTH	AWD Mk I (A) G09	2014-2017
Vauxhall	Insignia	Diesel Estate	2.0 D	1956cc 125KW 170HP B 20 DTH;D 20 DTH	FWD Mk II (B) Z18	2017-2024
Vauxhall	Insignia	Diesel Estate	2.0 D	1956cc 125KW 170HP D 20 DTH	FWD Mk II (B) Z18	2017-2024
Vauxhall	Insignia	Diesel Estate	2.0 D 4x4	1956cc 125KW 170HP B 20 DTH;D 20 DTH	AWD Mk II (B) Z18	2017-2024
Vauxhall	Insignia	Diesel Hatch	2.0 CDTi	1956cc 125KW 170HP B 20 DTH	FWD Mk I (A) G09	2014-2017
Vauxhall	Insignia	Diesel Hatch	2.0 CDTI 4x4	1956cc 125KW 170HP B 20 DTH	AWD Mk I (A) G09	2014-2017
Vauxhall	Insignia	Diesel Hatch	2.0 D	1956cc 125KW 170HP B 20 DTH;D 20 DTH	FWD Mk II (B) Z18	2017-2024
Vauxhall	Insignia	Diesel Saloon	2.0 CDTi	1956cc 125KW 170HP B 20 DTH	FWD Mk I (A) G09	2014-2017
Vauxhall	Insignia	Diesel Saloon	2.0 CDTI 4x4	1956cc 125KW 170HP B 20 DTH	AWD Mk I (A) G09	2014-2017
Vauxhall	Zafira	Diesel MPV	2.0 CDTi	1956cc 125KW 170HP B 20 DTH	FWD Mk III P12	2015-2018
Make	Model	Variant	Type	Engine	Chassis	Year

Our SKU: TVAU55500319-320PAIR_94

All our Pair Of Nox Sensors For Vauxhall Cascada W13 Insignia MK1 G09 Insignia B MK2 Z18 are OEM quality and reliable after market car parts. This Pair Of Nox Sensors For Vauxhall Cascada W13 Insignia MK1 G09 Insignia B MK2 Z18 is specifically compatible with Opel: Cascada, Insignia, Zafira Tourer, Vauxhall: Cascada, Insignia, Zafira, .

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

• Complete Sensor Set: Includes both NOx sensors (pre-SCR and post-SCR positions), providing full emissions monitoring required by the ECU for accurate NOx control.

• OEM-Referenced Quality: Designed for direct replacement on vehicles that originally used these sensors, with compatibility across diesel Cascada and Insignia models and related Opel/Vauxhall diesels.

• Improves Emissions Control: Accurate NOx monitoring helps the engine adjust after-treatment strategies to reduce nitrogen oxide output and avoid emissions-related fault codes.

• Restores Driveability: Faulty NOx sensors can trigger warning lights, limp-mode or reduced performance; replacing them with a paired set supports smooth throttle response and engine efficiency.

• Durable Diesel-Grade Components: Constructed to withstand high exhaust temperatures and corrosive diesel by-products — essential for long-term durability.

Frequently Asked Questions (FAQs)

Q1: What is a NOx sensor and what does it do?
A: A NOx sensor measures nitrogen oxide levels in the exhaust and sends the data to the engine control unit (ECU), which adjusts combustion parameters and AdBlue dosing to reduce harmful emissions.

Q2: Why are two sensors included?
A: Diesel vehicles with SCR systems generally use two NOx sensors — one before and one after the SCR catalyst — so the ECU can compare emissions before and after treatment for accurate control.

Q3: Which vehicles are these sensors compatible with?
A: This sensor pair is commonly compatible with Vauxhall/Opel Cascada W13 and Insignia (Mk1 G09 and Mk2 Z18) diesel models equipped with 2.0 CDTi engines — usually built between roughly 2014–2024. Always verify your vehicle’s year, engine code and old part number before ordering.

Q4: What are signs the NOx sensors need replacing?
A: Common symptoms include check engine or emissions warning lights, poor idle, reduced performance, increased fuel consumption or failed emissions tests — often due to incorrect NOx readings.

Q5: Is installation difficult?
A: Replacing NOx sensors involves working on the exhaust system around the SCR/catalyst area and usually requires clearing ECU codes afterward — professional installation or experienced DIY skill is recommended.