Removing sensors (NOx, temperature, differential pressure)
Remove sensors without damage
The problem Seized sensors
Seized sensors can be efficiently removed with the right special wrenches and adapters – without breaking parts and with a clean force fit.
Modern vehicles are equipped with dozens of sensors: lambda sensors, NOx sensors, temperature sensors, pressure sensors, ABS sensors. These components often operate under extreme conditions – heat, moisture, salt, and vibrations.
After years of service, many sensors seize in place. One wrong move can snap the sensor, damage the thread, or destroy expensive components.
- Lambda sensors in the exhaust system (up to 900°C)
- NOx sensors (high temperatures, corrosion)
- Temperature sensors in the cooling system
- Pressure sensors in the A/C system and engine
- ABS sensors on wheel hubs (dirt, rust)
Risks
Without the right tool, you risk:
Sensor breaks off (thread remains in the component), thread in the component is damaged, cable tears off, component (e.g. exhaust manifold) is damaged.
The cost of consequential damage often exceeds the price of the right tool many times over.
Special tools for safe removal
There are suitable tools for every sensor type:
Sensor sockets: Special geometry for optimal force fit (e.g. 22 mm for lambda sensors). Deep sockets: For hard-to-reach sensors with long threads. Adapters: For various drives (ratchet, torque wrench, impact wrench). Penetrating fluid & heat: Supporting measures for particularly stubborn cases.
The tools are designed to enable maximum force transfer with minimal risk of damage.
Prevention & maintenance
A quick tip for practice: Special sensor grease or anti-seize paste should be applied with every sensor installation. This makes later removal significantly easier.
Regular maintenance: Sensors that are not defective do not need to be removed every time. However, the right tool should be on hand when needed.
Many workshops swear by our sensor tools because they noticeably simplify daily work. Fewer damages, less time spent, happier customers.
Frequently asked questions
Which sensor types can be removed (NOx, Lambda, differential pressure)?
With PICHLER tools, NOx sensors, Lambda sensors, differential pressure sensors and particulate filter temperature sensors can be professionally removed. Each sensor type has its own thread size and mounting position — the right specialised tool prevents damage. The 29-piece NOx tool set covers all common sensor types in modern exhaust systems.
Why do sensors often break off during removal?
Sensors are frequently located in hot exhaust areas and corrode heavily due to moisture and temperature cycling. The thread bonds with the carrier material, causing the sensor head to shear off when excessive torque is applied. Pre-treatment with penetrating oil and the use of suitable sockets significantly reduces the risk.
What is the NOx particulate sensor service kit?
The PICHLER NOx particulate sensor service kit is a 29-piece tool set for the professional removal and installation of NOx sensors and particulate filter sensors on all common vehicle types. It includes socket inserts, extensions and thread repair tools in case the thread has been damaged. The set is particularly helpful when working in hard-to-reach exhaust areas.
Which thread repair tools do I need for broken-off sensors?
For broken-off sensor threads you need drilling-out kits and matching thread repair inserts (HELICOIL or TIME-SERT) in the respective sensor thread size (e.g. M18x1.5 for Lambda sensors). PICHLER offers matched repair sets that combine drilling out, thread cutting and insert fitting in one workflow. This usually saves the component without costly head repair.
Can sensors be removed with universal sockets?
Standard sockets are unsuitable for many sensors, as cable connections or housing profiles require special contours. PICHLER offers sensor sockets with cable routing and special internal profiles that also work in confined mounting positions. For offset or deeply recessed sensors, articulated extensions are recommended.
How do I test a removed sensor for function?
A removed Lambda or NOx sensor can be checked with a multimeter for continuity and heater resistance. For a complete functional test, however, an OBD diagnostic device or sensor tester displaying real-time readings is required. If in doubt, replacing the sensor is advisable, as defective sensors lead to increased fuel consumption and higher emissions.