New Holland 3852 – ECU: Lambda Sensor Exceeded Maximum Blow Out Time

The lambda sensor has detected that the maximum allowed time for blow out has been exceeded. This indicates a potential issue with the sensor's ability to function within the specified operational limits. The 'blow out' process is a self-maintenance or diagnostic cycle where the system attempts to clean the sensor element of slag, soot, or contaminants. The fault is triggered when this process takes longer than permitted by the ECU, which could be due to a blockage, a slow-to-respond sensor, or a failure in the sensor's internal heating or control circuits.

• B110C
• B110CTC
• C238
• T5.100
• Compact Track Loaders
• 580 ST
• 590 ST
• 695 ST
• 110 U
• 115 U PRO
• 120 U
• 100
• 110
• 120
• SR270
• SR270B
• SR340B
• TR340
• TV380
• TV450B

1. 1

   Inspect the wiring harness and electrical connector for the lambda/NOx sensor for chafing, corrosion, or loose pins.

2. 2

   Check for exhaust leaks upstream of the lambda/NOx sensor, which can introduce excess oxygen and cause incorrect readings.

3. 3

   Review other active or stored fault codes related to the DPF system, temperature sensors, or other emission components.

4. 4

   Attempt to clean the sensor using a safe fuel additive or by carefully soaking the sensor tip in O2 sensor cleaner or brake cleaner (never use gasoline, acids, wire brushes, or scrapers). Allow it to air dry completely before reinstallation.

1. 1

   Prepare vehicle

   Disconnect the vehicle's battery to prevent electrical damage and ensure the exhaust system is cool to the touch.

2. 2

   Locate and disconnect module

   Locate the lambda/NOx sensor in the exhaust system and its corresponding control module. Disconnect the electrical connector and unbolt the module from its mounting bracket.

3. 3

   Remove the sensor

   Apply penetrating oil to the sensor threads and let it soak. Carefully unscrew and remove the sensor using a specialized oxygen sensor socket to avoid damaging the exhaust pipe threads.

4. 4

   Clean exhaust threads

   Clean the threads in the exhaust port using an M20 x 1.5 thread chaser to ensure a smooth installation and proper seal.

5. 5

   Install new sensor

   Apply a small amount of anti-seize compound to the threads of the new sensor (avoiding the tip). Thread it in by hand, then tighten to the manufacturer's specified torque using the sensor socket.

6. 6

   Install new module

   Mount the new sensor's control module onto its bracket and reconnect the electrical connector.

7. 7

   Finalize and verify

   Reconnect the battery, clear fault codes using a diagnostic tool, start the engine, and run any required relearn or calibration procedures. Verify fault code 3852 does not return.