Remapping for Opel 1.6 CDTI (B16DTH/L) engines with P118B fault

The P118B fault is a very common failure in Opel Zafira 1.6 CDTI LVL type (B16DTH/L) manufactured between 2014 and 2019, equipped with an AC Delco E98 ECU. This code appears when the system detects incorrect operation of the small temperature sensor integrated within the particulate filter (DPF) sensor. This internal sensor cannot be replaced separately, which usually requires changing the entire sensor and results in a high cost.

When this internal sensor starts to fail, it stops providing consistent values, and the P118B code reappears continuously, even after being cleared.

In most cases, the sensor continues to measure temperature but reads between 60° and 70°C higher than the other exhaust sensors. After several ignition cycles, the vehicle detects that this sensor indicates a temperature that is too high even when cold, and the MIL light illuminates with the P118B code. This fault does not affect vehicle power or block DPF regenerations.

With our reprogramming, we eliminate the specific diagnosis of the internal sensor, preventing the P118B code from reappearing and maintaining normal engine operation.

It is important to note that this internal sensor is not necessary for the particulate filter sensor to function correctly, so its imprecise reading does not affect vehicle performance.

This intervention is indicated when:

• The internal particulate filter sensor provides inconsistent readings, but the particulate filter sensor functions correctly.

• The P118B code reappears recurrently after being cleared.

• There are no other codes associated with mechanical or electrical failures.

• The sensor has already been replaced several times and fails again after 1-2 years.

Antipollution systems that remain active

All antipollution systems continue to function exactly as they do from the factory. Nothing is disabled:

• DPF (Diesel Particulate Filter) Maintains regenerations, saturation control, and thermal monitoring.

• AdBlue System (SCR) Retains dosing, injector control, NOx sensor, and all its diagnostics.

Diagnosis of the rest of the vehicle

The diagnosis and operation of the engine and all other components remain intact:

• Sensors and actuators

• DPF pressure

• Exhaust temperatures

• EGR

• Thermal management

• Engine protection strategies

Only the management of the P118B code is modified, without altering any other system.

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