A 2016 Hilux SR5 that was 'just doing a burn-off' every morning

Why this sounded believable

The seller was a plumber who'd owned the Hilux from new. Full Toyota service history to 90,000km, then independent after. The 'morning burn-off' explanation sounded plausible — every diesel owner knows DPF regen. What he didn't know was that a healthy regen finishes in 10–15 minutes and produces faint white vapour, not thick grey smoke that neighbours complain about.

What the scan tool found

• DPF soot loading: 168% — well past the 100% threshold where active regen reliably succeeds, and trending toward the forced-limp window.
• 14 failed active regen attempts in the rolling 500-cycle fault log.
• Glow-plug duty cycle at 94% — the ECU is working hard to heat the DPF and not getting there.
• Differential pressure sensor delta: 62mbar at idle (spec is under 15mbar).
• Live data during road test: DPF inlet temp peaked at 380°C — 120°C below the 500°C needed for passive regen.

Outcome

The buyer presented the scan-data printout and a quote from a Toyota specialist in Parramatta. The seller initially claimed 'all 2.8s do this' but couldn't explain the 168% figure or the 14-attempt failure log. After 36 hours the seller agreed to $38,190 — $4,800 off. The buyer had the DPF and glow plugs done within a week and the ECU reflashed at the dealer.

"I was two hours from signing. Marco plugged in his scan tool, showed me the failed-regen log on the screen, and said 'that's not a burn-off, that's a burial'. Best $349 I've spent on any ute."