U1221 Engine Fault Code

Check Solution For U1221 OBD Code :

U1221 engine code seems a kind of network problem, we try to show one by one the meaning and the solution.
Brief explanation of the U1221 code and definition of U1221 is the bottom side.

U1221 Meaning :

u Network Code
Problem is climate control system, lighting, airbags, etc.
1 MFG - Manufacturer Specific
2 BBV Sensor Circuit Low Voltage
2 BBV Sensor Circuit Low Voltage
1 Transmission

MFG - Manufacturer Specific codes, which have a '1' as their second digit to indicate they are unique to a particular vehicle make or model. These special codes were deemed necessary by the vehicle manufacturers so they could provide additional diagnostic information beyond the basic list of generic OBD II codes for all kinds of faults, not just emissions-related faults.

How To Fix U1221 ?

Like the all engines, the car engine system employs specially developed hydraulic lifters (known as switching roller followers) for the U1221 code intake and exhaust valves. The lifters can be collapsed by disengaging an internal locking pin. The locking pin is disengaged using solenoids to alter oil pressure fed into the lifter.

U1221 Code Description:

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. When you see U1221 engine fault code on your engine code reader this description will help you.

U Codes List of all Network codes.

Final Step: In the definitions listed below, there is a test drive recommended after you've completed any repairs to see if the condition is fixed. Before you take a test drive after a repair, always erase the U Code(s) first. This will turn the check engine light off and then you will know if the check engine light returns, you've got further diagnostics to complete.

BE CAREFUL !
This engine code information is presented for information purposes only. This is not intended as repair advice and we are not responsible for any actions you take on any vehicle.

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