SQ5 · week of Oct 20 to Oct 27 · generated 2026-10-27

Weekly health

What the car's own logger says about the last seven days, in the words I'd want to read on a Sunday evening. Verdict first, then what to do, then the evidence with its threshold.

Needs attention

4 findings this week

FLAG
weakest start dipped to 8.43 V — that is a weak battery (healthy is above 10)doget the battery load-tested
WATCH
the Pi rebooted 149 times across 3 overnight park(s) — that is what drains the batterydounplug the OBD dongle when the car sits overnight
WATCH
38% of your boost was on cold oildooil takes ~30 min to warm up — go easy until then
WATCH
idle is rougher than normal (fits the misfires)

The week in numbers, each with its line

Oil, hottest

104°C

fine, worry starts at 130

Transmission fluid, hottest

93°C

fine, worry starts at 110

Misfires per 10,000 firings

9.6last week 8.5

about the same as last week

Boost on cold oil

38%

above 25%; go easier until the oil is warm

Deepest knock correction

-3.8°

fine, worry at −6 and beyond

Driving

14trips

112 km · 3.3 engine hours · 7 cold starts

Which cylinder

Each cylinder's warm misfire rate this week as a multiple of the median of the other five. Amber from 1.25×, red from 1.5×. Exact values are listed below; 1× means the same rate as the sibling median.

Warm misfire rate / sibling median
Cylinder	Ratio	Threshold band
Cylinder 1	0.53×	Below 1.25×
Cylinder 2	0.71×	Below 1.25×
Cylinder 3	1.71×	At least 1.5×
Cylinder 4	1.21×	Below 1.25×
Cylinder 5	0.82×	Below 1.25×
Cylinder 6	1.29×	At least 1.25×

How this is made

A Raspberry Pi in the footwell logs 53 engine-computer channels five times a second on every drive and pushes the data home. A Sunday job compares the week to the week before and to a four-week baseline. The verdict rules are written down: oil at or above 130 °C or transmission fluid at or above 110 °C flags; a crank below 9.6 V flags; misfires at 1.5× the baseline flag and 1.25× is a watch; any Pi boot storm is a watch. Nothing here is a guess, and nothing here is live: this is a static snapshot by design. More in the garage.