hello i have code 1212,0011,0021 and d001 can you help, could it be wiring harness

Question

nissan altima 2002 what do you think?

Answer 1

For p1212 start by checking the battery (you can have it tested for free at Pepboys or Autozone) otherwise the code is related to the ABS actuator and electric unit

p0011 and P0021 start by replacing the oil and oil filter and resetting the light (use 5w-30 oil)

D001 does not exist