Expert answer

Camshaft sensors in most cars are really easy to change, though as with all things under the bonnet we'd always recommend that you bring your car to an expert unless you know what you are doing.

In most cases this work would take 10-15 minutes.

Without the car in front of me, or a workshop manual, I would hesitate to give you more precise instructions, but usually the sensor is held on by just one or two bolts and an electrical connector.

Assuming that is the case, remove the bolts and connector and reverse the procedure for the replacement sensor. Be careful that you do not damage the new sensor.

You should be aware that some cars may need their on-board computer (the Engine Control Unit - or ECU) reset following this operation. Ideally this would be done by a main dealer or garage with the correct equipment.

What has lead you to diagnose a problem with the sensor? (You can reply in the comment box below)

Expert answer

Hi Patricia,

The correct tyre pressures for the Citroen Xsara from 1997-2000 are 31 psi front and rear, but you might want to adjust this upwards slightly if you carry a fully laden car.

Remember to check your tyre pressures every 2 weeks to ensure you have the correct pressure as under-inflation can cause uneven tyre wear and decrease fuel economy. You can buy small devices to check your tyre pressure at places like Halfords or other car parts outlets.

As regards the Xsara owner's handbook, you could go down the route of getting them from a dealer, but we reckon eBay is your best (and cheapest) bet. We found one for around a tenner here

Hope this helps!

Expert answer

Well you haven’t said what your budget is but there are plenty of interesting cars that are available under the scrappage scheme.

Alfa Romeo’s Mito is a small premium hatchback, and its clean 1.3-litre diesel engine puts it in Band A; the 1.4-litre petrol and 1.6-litre diesel models fall into Band B. Prices start at €18,995 before you take away the government discount.

The Audi A3 with the 1.2-litre TFSI petrol, the 1.6-litre diesel and 2.0-litre diesel all qualify for scrappage, as does the Cabriolet version. The A3 3-door starts from €25,195 before scrappage discount, it’s €26,195 as a 5-door Sportback model, and €32,785 for the Cabriolet version before the €1,500 discount.

The A4 with a 2.0-litre diesel engine in either 120bhp, 136bhp and 170bhp all fall under Band B in either saloon or Avant form. Prices start from €34,060 (€32,560 with scrappage) for the diesel saloon and €36,460 (€34,960 with scrappage) for the Avant. The stunning A5, with a 170bhp 2.0-litre diesel engine, falls into Band B. Prices start at €44,265 (€42,765 with scrappage). You can also have the Audi A6 2.0-litre TDi with 136bhp, which is in Band B. This huge car starts from €39,735 (€38,235 with scrappage). The Audi TT diesel is a really superb car to drive. At €44,175 for the Coupé (€42,675 with scrappage), this is a brilliant buy and that fact that it costs €156 per year to tax makes it all the sweeter.

BMW also has a huge number of models that qualify for the scrappage scheme. Its 2.0-litre diesel is used in various power outputs across the 1-Series, 3-Series and 5-Series and these all have emissions of less than 140g/km, even when fitted with an automatic transmission.

The 1-Series is available with clean diesel engines ranging in power from 115bhp to 177bhp. Prices start at €24,900 for the 3-door 116d, €23,400 with the scrappage discount.

The BMW 3-Series starts from €33,310 for the 316d. All its models get €1,500 off from the government through scrappage. Largest of all is the 520d. Although there is a new model coming later in the year, the run-out models of the 520d are expected to sell well, especially with a price tag of €40,220.

Mercedes-Benz has a number of models that qualify under the scrappage scheme. The standout model is the C-Class Blue Efficiency 200 (136bhp), 220 (170bhp) and 250 (240bhp) manual versions, the E-Class 200, 220 and 250 manual version and the E-Class Coupé 220 and 250 models with manual transmission. Prices start at €36,500 (€35,000 with scrappage) for the C200 CDi, €41,200 (€39,700) for the E200 CDi and €47,700 (€46,200) for the E-Class Coupé E250 CDi.

Finally, what about the Volkswagen Scirocco? You can have the 1.4-litre TSi petrol or 2.0-litre TDi Sport model under the scrappage scheme. Prices start at €25,190 for the Scirocco (€23,690 with scrappage),

To answer your question though, which is fastest? We think it is the BMW 123d Coupe. It has emissions of 138g/km yet has a top speed of 238km/h and 0-100km/h time of 6.9 seconds. This is faster than the Audi TT TDi, which has a top speed of 226km/h and 0-100km/h time of 7.5 seconds.

Expert answer

Firstly, there are probably more diesel automatic cars in Ireland than you might think, but they tend to be executive models rather than mainstream family cars because it seems that there still isn't a huge demand for them.

Toyota does in fact sell an automatic version of its Avensis. It is a 2.2-litre 150bhp diesel and that costs €35,530. Since you mentioned the Toyota Avensis we must assume that you are after a family saloon or hatchback so for a start you could have a Ford Mondeo 2.0-litre TDCi Style Auto for €32,225 - that comes as a saloon, hatchback or estate.

For you a few quid more you can have the run out version of the Jaguar X-Type 2.2 Diesel Auto for €32,995 or you could have the Mercedes-Benz B180 CDi Auto from €33,640.

There are loads of versions of the excellent Opel Insignia available with a choice of 130- or 160bhp diesel engines in saloon, hatchback or estate body styles. There are 24 different Insignia diesels available in total. Prices start at €30,380. You can have a Renault Laguna 2.0-litre dCi 150 TomTom Edition for €36,890.

A Volkswagen Passat 2.0 TDI with the excellent DSG gearbox will cost you from €35,960 and Skoda will sell you something with DSG for even less. How about an Octavia RS 2.0-litre diesel with 170bhp and DSG for €31,195? For us, that last car is the top choice. However you could stick with Skoda and go much bigger and that would be the Superb. You can have that with DSG and 170bhp for €31,195.

There is a fuel economy penalty in some cases and that is because the traditional automatic transmission has a torque converter. Automatic cars are generally a little heavier too, to the detriment of economy. Saying that, the latest generation of dual-clutch automatics and some of the newest conventional autos have massively improved.

Fuel economy and CO₂ emissions are directly linked, so often the manual version of a car can be in a lower tax band than their automatic siblings, but this is starting to change as mentioned above.