P229F on Opel
NOx Sensor Circuit Range/Performance (Bank 1 Sensor 2)
P229F on Opel vehicles indicates nox sensor circuit range/performance (bank 1 sensor 2). Au7o has documented this code across 3 Opel models — most commonly on Combo, Grandland, Zafira. P229F indicates the engine control module detected a range/performance problem with the downstream NOx sensor on bank 1 (sensor 2), most common on diesel vehicles with SCR/AdBlue emissions systems. The NOx sensor measures nitrogen-oxide levels in the exhaust so the system can dose diesel exhaust fluid correctly and verify the catalyst is working. An implausible or out-of-range signal can trigger emissions warnings, reduced power, and on many diesels eventual no-start countdowns tied to emissions compliance. It is an emissions-system fault that should be addressed before it escalates. Typical repair costs on Opel range from $150 to $1,200, depending on the specific model and root cause.
Common Causes of P229F
- •Faulty downstream NOx sensor (bank 1 sensor 2)
- •Wiring or connector corrosion at the NOx sensor
- •Exhaust leak upstream of the sensor
- •Contaminated or incorrect diesel exhaust fluid (DEF/AdBlue)
- •SCR catalyst degradation
- •NOx sensor control-module communication fault
- •ECM software needing update/recalibration
P229F on Opel by Model
Opel Combo(1 issue)
- Diesel AdBlue / SCR system failure preventing engine restart2018-2024
Combo diesels with the BlueHDi SCR (AdBlue) emissions system can display escalating warnings such as 'Add AdBlue: Start impossible in X km' or 'Engine restart disabled in X km'. Beyond simply running low on AdBlue, the warnings are commonly triggered by SCR/NOx sensor faults, AdBlue tank-level or quality sensor errors, AdBlue crystallisation, or the use of non-ISO 22241 fluid. Once the countdown reaches zero the ECU disables engine restart by emissions regulation, leaving the owner stranded.
Opel Grandland(1 issue)
- Diesel SCR/AdBlue & NOx Sensor Emissions Fault with 'Starting Impossible' Limp Mode2017-2023
Diesel Grandland X models (1.5 BlueHDi/1.6 diesel with SCR after-treatment) frequently throw exhaust after-treatment faults. Owners see emissions warnings, reduced power/limp mode, and the countdown message 'Engine start prevented in XXX miles/km'. Common root causes are NOx sensor failure (range/performance faults), SCR system or AdBlue injector/pump faults, crystallised AdBlue, or poor-quality urea. If ignored, the car eventually refuses to start. Critical phase is commonly around 30,000-45,000 km.
Opel Zafira(1 issue)
- NOx Sensor / SCR System Failure on Euro 6 Diesels (Zafira Tourer C)2015-2019
Euro 6 diesel Zafira Tourer C models with SCR/AdBlue (1.6 CDTi B16DTH and 2.0 CDTi B20DTH/D20DTH) commonly suffer NOx sensor failure. The upstream/downstream NOx sensors degrade and report implausible values, setting catalyst-efficiency and NOx-sensor codes (e.g. P20EE, P229F, P118B) and putting the car into reduced power / limp mode with an emissions warning and a restart countdown in some cases. German owners (motor-talk.de) report this as a known fault from around 80,000 km. NOx sensors are relatively expensive genuine parts and often fail again if cheap aftermarket units are used.
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View P229F across all makes →Frequently Asked Questions
What does P229F mean on Opel?▼
P229F stands for "NOx Sensor Circuit Range/Performance (Bank 1 Sensor 2)." P229F indicates the engine control module detected a range/performance problem with the downstream NOx sensor on bank 1 (sensor 2), most common on diesel vehicles with SCR/AdBlue emissions systems. The NOx sensor measures nitrogen-oxide levels in the exhaust so the system can dose diesel exhaust fluid correctly and verify the catalyst is working. An implausible or out-of-range signal can trigger emissions warnings, reduced power, and on many diesels eventual no-start countdowns tied to emissions compliance. It is an emissions-system fault that should be addressed before it escalates. On Opel specifically, this code is documented across 3 models.
What causes P229F on Opel vehicles?▼
Common causes on Opel: Faulty downstream NOx sensor (bank 1 sensor 2), Wiring or connector corrosion at the NOx sensor, Exhaust leak upstream of the sensor, Contaminated or incorrect diesel exhaust fluid (DEF/AdBlue), SCR catalyst degradation. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P229F on a Opel?▼
Repair costs on Opel range from $150 to $1,200, depending on the specific model and root cause.
Which Opel models have P229F documented?▼
Au7o has documented P229F on 3 Opel models: Combo, Grandland, Zafira.