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2. Engine knocking - Wikipedia

   en.wikipedia.org/wiki/Engine_knocking

   A control loop is permanently monitoring the signal of one or more knock sensors (commonly piezoelectric sensor which are able to translate vibrations into an electric signal). If the characteristic pressure peak of a knocking combustion is detected the ignition timing is retarded by steps of a few degrees.

3. Motronic - Wikipedia

   en.wikipedia.org/wiki/Motronic

   The Motronic 1.1 and 1.3 systems are largely similar, the main improvement being the increased diagnostic capabilities of Motronic 1.3. The 1.3 ECM can store many more detailed fault codes than 1.1, and has a permanent 12-volt feed from the vehicle's battery which allows it to log intermittent faults in memory across several trips.

4. Tap code - Wikipedia

   en.wikipedia.org/wiki/Tap_code

   The tap code, sometimes called the knock code, is a way to encode text messages on a letter-by-letter basis in a very simple way. The message is transmitted using a series of tap sounds, hence its name. [1] The tap code has been commonly used by prisoners to communicate with each other.

5. Check engine light - Wikipedia

   en.wikipedia.org/wiki/Check_engine_light

   For example, in several Mazda models, the light will come on at 80,000 miles (130,000 km) and remain lit without generating a computer trouble code. [citation needed] Volvo had a light labeled "lambda", lambda sond being another name for oxygen sensor. This was done in order to remind the driver to change the oxygen sensor.

6. Knock-for-knock agreement - Wikipedia

   en.wikipedia.org/wiki/Knock-for-knock_agreement

   [1] Oil and Gas Industry 'Knock for knock' is a common contractual arrangement in the oil and gas industry. [2] The operator of an oil and gas property requires the assistance and expertise of many kinds of contractors, including drilling companies, well service companies, facility constructors, equipment suppliers, and caterers.

7. Port knocking - Wikipedia

   en.wikipedia.org/wiki/Port_knocking

   Defeating port knocking protection requires large-scale brute force attacks in order to discover even simple sequences. An anonymous brute force attack against a three-knock TCP sequence (e.g. port 1000, 2000, 3000) would require an attacker to test every three port combination in the 1–65535 range and then scan each port between attacks to uncover any changes in port access on the target ...

8. Oxygen sensor - Wikipedia

   en.wikipedia.org/wiki/Oxygen_sensor

   An oxygen sensor (or lambda sensor, where lambda refers to air–fuel equivalence ratio, usually denoted by λ) or probe or sond, is an electronic device that measures the proportion of oxygen (O 2) in the gas or liquid being analyzed. [1] It was developed by Robert Bosch GmbH during the late 1960s under the supervision of Günter Bauman. [1]

9. Error code - Wikipedia

   en.wikipedia.org/wiki/Error_code

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