Lambda reading outside limits on the Porsche Boxster

Lambda reading outside limits on the Porsche Boxster is recorded on 2,463 tests — 2.5% of all its MOT tests, against 0.5% across every car in the data. That is 5.0× the national share.

Is this unusual for this model?

Compared with	What it says
Every car in the data	0.5% of tests record it — this model is 5.0× that share
The 183 models compared	9 of 183, highest first
The model's own record	99,894 tests · every year of the Boxster →

A share of tests is not a probability for your car: it counts every Porsche Boxster 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 2000, 2.2% of this model's tests recorded it; in 2013, 0.3%. The share has fallen 1.9 points over that time. Worst year 2004 at 2.9%; best 2012 at 0.3%.

Year	Failures recorded	Tests	Share of tests
2000	292	13,234	2.2%
2001	319	14,504	2.2%
2002	319	14,914	2.1%
2003	477	17,086	2.8%
2004	414	14,320	2.9%
2005	335	21,908	1.5%
2006	122	12,514	1.0%
2007	67	10,596	0.6%
2008	42	3,487	1.2%
2009	8	2,678	0.3%
2010	9	2,537	0.3%
2011	8	2,468	0.3%
2012	9	3,479	0.3%
2013	14	3,944	0.3%

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 £60–£250 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

Lambda reading outside limits: every model, every year → — the item's own page, with the part guide.
Porsche Boxster MOT pass rate by year → — the model's whole record, and what else it fails on.
Every Porsche model →