In this video I show the NOx sensor location on a 2018 Mercedes GLA 200d (X156) equipped with the OM651 diesel engine.
If your car has an AdBlue warning, reduced power, or fault codes such as P2202 / P2200 / P229F, the NOx sensor may be faulty.
This guide clearly shows where the sensor is mounted and how to visually access it.
This applies to Mercedes GLA 200d / 220d models from 2015–2020 with OM651 engines.
⸻
WHAT’S INCLUDED:
• NOx sensor location on the exhaust system
• Upstream vs downstream NOx sensor explanation
• Accessing the wiring connector
• Basic removal overview (for reference only — no coding shown)
• Common signs of a faulty NOx sensor
If your car has an AdBlue warning, reduced power, or fault codes such as P2202 / P2200 / P229F, the NOx sensor may be faulty.
This guide clearly shows where the sensor is mounted and how to visually access it.
This applies to Mercedes GLA 200d / 220d models from 2015–2020 with OM651 engines.
⸻
WHAT’S INCLUDED:
• NOx sensor location on the exhaust system
• Upstream vs downstream NOx sensor explanation
• Accessing the wiring connector
• Basic removal overview (for reference only — no coding shown)
• Common signs of a faulty NOx sensor
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