Check engine light on with multiple codes P2063, P21A8, P2620 and P2621

Hello,

if you have no symptoms I would erase the codes and see if the light comes back. It could be a stored code that has already been taken care of. Is this car diesel?
Tom

Check your DEF temperature sensor.

Hi,

I'll shorten it and reword it to basic. A temperature sensor in the exhaust pipe ahead of the metering valve measures the exhaust gas temperature. The injection mixture starts when at least 200°C is measured here. The sensor is located before the SCR catalytic.
So much for the detailed system explanation but the basic thing is that you need to check both the Throttle Position Sensor and the DEF system temperature sensor. Then all the basic connections at the plugs and the normal things you would go through. Melted wire from hitting the exhaust system and the like.
Hope this works

Hi, The left side should be side towards the motor.
Tom

Hi Naser,

It was leaking at some point if not currently, Is that frozen in the pic? Either way that connector is most likely compromised. Did you pull it apart to check?
Tom

Hello,

Disconnect the plug shown and look at the pins inside and make sure there not corroded or anything but nice and clean and the female side that the holes aren't stretched out. If at some point it did in fact freeze or while the Def fluid dried out female part could have expanded the terminals so the male part doesn't fit nice and tight. Definitely check to see that the male pins are fitting tightly.
Tom