Exhaust system insecure on the Citroen C4

Exhaust system insecure on the Citroen C4 is recorded on 14,972 tests — 3.0% of all its MOT tests, against 1.1% across every car in the data. That is 2.7× the national share.

Is this unusual for this model?

Compared with	What it says
Every car in the data	1.1% of tests record it — this model is 2.7× that share
The 257 models compared	44 of 257, highest first
The model's own record	504,935 tests · every year of the C4 →

A share of tests is not a probability for your car: it counts every Citroen C4 tested, whatever its mileage, service history and use. The like-for-like comparison on the model page is the fairer number.

Year by year

In 2005, 1.4% of this model's tests recorded it; in 2019, 0.6%. The share has fallen 0.9 points over that time. Worst year 2006 at 2.1%; best 2010 at 0.3%.

Year	Failures recorded	Tests	Share of tests
2005	164	11,343	1.4%
2006	463	22,431	2.1%
2007	600	68,322	0.9%
2008	469	88,383	0.5%
2009	215	62,226	0.3%
2010	183	73,743	0.3%
2011	438	83,025	0.5%
2012	546	98,739	0.6%
2013	531	144,384	0.4%
2014	1,624	242,403	0.7%
2015	5,796	313,761	1.9%
2016	3,498	193,770	1.8%
2017	37	10,227	0.4%
2018	112	18,922	0.6%
2019	266	48,360	0.6%

Years with fewer than 0.2% of tests recording the item are left out: a year with two failures in 400 tests is noise, and this table is not here to make noise look like a trend.

What it costs

A typical UK repair for this item is £45–£120 fitted. It is a job for a garage, not a driveway. What the part is, and what to buy →

Prices are typical UK supply-and-fitting estimates, not quotes. What happens if it fails covers the retest rules.

Where this sits

Exhaust system insecure: every model, every year → — the item's own page, with the part guide.
Citroen C4 MOT pass rate by year → — the model's whole record, and what else it fails on.
Every Citroen model →