Based on the available data, the private sale price for an Audi A4 (2001-05) 4DR Saloon 1.8T Quattro SE is consistently reported at 1000 GBP or less, with the entire price range categorized under the "0 to 1000" pounds bracket. This indicates that these vehicles tend to have relatively low private sale values, suggesting they are typically affordable options or may have factors such as age, mileage, or condition that result in lower market prices. It’s important to note that no data points are provided for higher price ranges, so the auction or resale values likely cluster at the lower end of the spectrum.

The data indicates that all vehicles of the AUDI A4 (2001-05) 4DR Saloon 1.8T Quattro SE model analyzed have an engine capacity of 1,781 cc. Additionally, these vehicles exclusively use petrol as their primary fuel type. This consistent specification suggests a uniform model configuration within this vehicle group, which can be helpful for buyers or service providers seeking specific engine or fuel details.