There are many people whose Spanish driving licences have expired without their realising as they were expecting to receive a renewal reminder.

At present it appears that Tráfico are not sending out renewal reminders, so it is up to us to remember! The process for renewal of your Spanish drivers licence is as follows.
You need to present in Tráfico or have somebody present on your behalf the paperwork:
* The application forms for the renewal of the driver’s licence that can be obtain from www.dgt.es .
* To pay the renewal cost of €22.22
* N.I.E form and Certificado de Empadronamiento or the Green Residencia form and photocopies.
* Passport and photocopies.
* Expired licence.
* Medical certificate from an authorised medical centre to prove that you a fit and able to renew your licence.
* A photograph of maximum size 32 x 26 mm in colour with a plain background.
* A photo signature application form that can be obtained from Tráfico.
The licence can be renewed up to three months before it is due and can be renewed after its expiry date but driving when it is expired can be penalized with a fine.
Staying on the same subject if you decide to exchange your foreign licence for a Spanish one you would need to follow the next two steps.
In the first instance you need to present Tráfico with photocopies of your licence, passport and NIE or Residencia along with a signed declaration telling them what you a presenting and that you are happy for them to carry out the paperwork on your behalf, this form is available from Tráfico. You would then need to wait 45 days from the date of presentation to complete the process as Tráfico need to contact the authority that issued the licence to check the licence is still valid and that it has not been revoked for any reason.
After the 45 days you would need to present the following documentation to Tráfico in order to complete the process.
* The application forms for the renewal of the driver’s licence that can be obtain from www.dgt.es .
* To pay the renewal cost of €26.26.
* The Green Residencia form and photocopies.
* Passport and photocopies.
* A photograph of maximum size 32 x 26 mm in colour with a plain background.
* A photo signature application form that can be obtained from Tráfico.
* The licence that you are exchanging.
* Declaration form available from Tráfico.
If the licence that you are exchanging is still in date you do not need a medical certificate. If however the licence has expired you will need to have the same documentation but you need to pay for inscription and then an exchange at a cost of €30.10 and also you need a medical certificate.

Source:Tenerife News