What is limp home mode or limited operating strategy?
When a sensor failure is detected the ECU is programmed to substitute a mid range value or calculate a suitable value from other sensors in an attempt to keep the engine running. As it is not possible to keep tight control on all the operating conditions of the engine with a faulty sensor the ECU will often limit how much performance is available in order to prevent engine or catalytic converter damage. The limp home mode is often similar for different fault conditions it is therefore often impossible to decide what the fault is from the symptoms. A plug-in to the diagnostic computer is the only way forward.
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