This error code has to do with Mass Airflow Sensor. A broken wire, bad connection or dirty sensor.
To clear the E21 error code on a Nissan forklift, first, identify and resolve the underlying issue causing the code, typically related to the battery or electrical system. Once the issue is addressed, turn off the forklift and disconnect the battery for a few minutes to reset the system. Reconnect the battery, then start the forklift to see if the error code has cleared. If the code persists, further diagnostic checks may be necessary.
An E21 error code on a Nissan 50 forklift typically indicates an issue with the forklift's battery or charging system. This may involve low battery voltage or problems with the connections between the battery and the forklift's electrical system. It's advisable to check the battery's condition and connections or consult the forklift's manual for specific troubleshooting steps. If the problem persists, contacting a qualified technician is recommended.
21 is for the oxygen sensor reading staying at center.
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The code for Level 21 is 259205 The code for Level 22 is 279516
In the times I've encountered this error code, It has meant that the network is down, it's a documented thing, just google the code and 9 out of 10 times you'll see the network is down in the results from the search, and come to think of it the network is down currently right now as I type this, 1 or 2 days this time. 4-21-11
Code 21 indicates ECT out of self-test range
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21 city, 29 hwy
Bewitched - 1964 The Trial and Error of Aunt Clara 3-21 is rated/received certificates of: Argentina:Atp Australia:G
Bewitched - 1964 The Trial and Error of Aunt Clara 3-21 was released on: USA: 2 February 1967