Hundreds of people ed searches for Mrs Birbeck when she disappeared from her home in Huncoat, Accrington. The boy, from Accrington, who cannot be named because of his age, appeared at Blackburn Magistrates' Court.
The Peugeot was later recovered from Lemonius Street. The teenager was remanded into secure accommodation ahead of a hearing at Preston Crown Court on Tuesday.
Mother-of-two Lindsay Birbeck, 47, was missing for almost two weeks before her body was found at Accrington Cemetery, Lancashire, on 24 August. He suffered serious injuries and was pronounced dead at the scene, Lancashire Police said. Related Topics Huncoat From other local news sites.
Paying tribute to Mr Sodagar, who was from Accrington, his family said he "put smiles on many faces" and was "best known for accrrington positive energy, always bringing people together, a believer in love and a man of good morals and principles". Related Topics Accrington From other local news sites.
The two year-old men have been arrested on suspicion acccrington causing death by dangerous driving. He is accused of murdering the teaching assistant between 12 August and 24 August.
Last week, her children - Steven, 19, and Sarah, 16 - described her as "a great mum and wife, much-loved daughter, loving aunty and sister-in-law and a great friend too". The pair, from Accrington, are being held in police custody.
Police have appealed for information and said officers were keen to trace the driver of a black BMW car, who is believed to have witnessed the incident.