Criminal

Back in september, I had an accident. The police told me that they were investigating me for dangerous driving although the accident was due to a vehicle fault. Unfortunatly, tests came back saying there was no fault but I am adamant that there was. I havent heard anything since december, although the police had told me that the case had been passed to the CPS. Is this usual? Am I to asume that there will be no charges? Its kind of hard to get on with my life at the moment but Im too scared to ring them and find out.

Edit
After nine months of waiting for CPS to make their minds up about what they're going to do, I got a call today from my solicitors who have said that CPS are waiting for a report from the vehicle manufacturer. It seems that they are going all out to prosecute me.
My solicitor has suggested that I may have hit the accelorator instead of the brake. This stems from the mechanics report. Although this is possible, I am adamant it didnt happen and dont want to admit to something that Im not 100% about. It also seems that CPS are going to go with this theory too.
Im more worried about this than ever because I have read about people still going to prison for this mistake. Afterall, it is a mistake made out of panic in the end.
Any one have any advice because Im very worried. I am a lonedad to a 9 month old and Im scared about what will happen to her if they send me to prison.