P0021

[Katanda]

Help. How can I fix P0021 error. Failed Smog test.

 

[enrique_7812x]

P0021 (and P0011) is apparently a generic OBDII code affecting multiple brands and models with VVT (variable valve timing). I had P0011 come up several years ago on my 2007 Infiniti G35 which I wasn't driving much (2000 miles/yr). I took it to a local respected independent shop and had them do a $120+ diagnostics. In my case, there were 2 options. Cheapest was an oil change and hope the code didn't come back. The other was to replace the intake camshaft solenoid for Bank 1 (+$500 P & L) plus an oil change. The actuator was sticking due to bad oil, which was due to not driving it much. I went the cheap route and the code came back in a month. It's now good after replacing the solenoid.

Code P0021 came up last year for Bank 2 which was kind of expected. I had that solenoid replaced, and now it's fine. They suggested I now drive it more and harder.

Hyundai Genesis P0021: OBDII Code Diagnosis | Drivetrain Resource

P0021 is a common trouble code. It affects vehicles with variable valve timing (VVT). The list of VVT vehicles is growing, and the Hyundai Genesis can have VVT, and is prone to developing this code. P0021 is a generic OBDII code. This means that it has the same definition regardless of the make

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