The naturally aspirated four-cylinder behind the TSX and early RDX — widely regarded, with good reason, as one of the toughest mainstream engines of its era.
There isn't a long list of known failure points here, which is itself the point — this engine's reputation is built on genuine, documented longevity rather than marketing. Timing chain (not belt), simple naturally aspirated architecture, and Honda's typically conservative factory tuning combine to make this one of the lowest-risk used-engine choices in this entire catalogue.
Not a guarantee, but a pattern seen consistently across owner forums and independent-garage reporting.
First motor mount replacements become common — a maintenance item, not a red flag.
Valve cover gasket seep and mild oil consumption increase may appear.
Core engine mechanicals are routinely still original on examples with documented oil changes.
Listen at idle for a VTEC solenoid rattle, most audible on startup — cheap to address but worth a small negotiation if present.
Check for vibration at idle in gear, a sign of worn motor mounts rather than an engine problem.
Beyond these two items, there's little else specific to flag — this is about as close to a low-risk used engine as this catalogue covers.
Model-specific pages, with notes on how it behaves in that particular car.