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2018 Toyota Camry recalled because pistons are too big

An unusual but serious recall of a perennially popular midsize sedan is being blamed on out-of-spec parts.

2018 Toyota Camry

Toyota is recalling select 2018 Camry sedans equipped with 2.5-liter, four-cylinder engines because of an unusual and potentially serious engine problem.

According to the Japanese automaker, 1,730 examples of its midsize sedan may have engines that were produced with pistons that are too large. These out-of-spec parts could "cause the vehicle to run rough, create an abnormal sound, emit smoke from the exhaust and illuminate warning lights and messages." These overlarge pistons could result in a loss of power, or cause the engine to stop running altogether.

Toyota says that the problematic pistons are "from a particular production period," late December 2017 through mid-January 2018. This helps explain why the number of models affected by the campaign is so small compared to the total production of such a high-volume model. (Toyota sold 387,000 Camrys in 2017.)

If you're wondering how pistons that are too large found their way into cylinder blocks, it's worth noting that engines are built with incredibly exactly tolerances, and this doesn't sound like it would be an easy-to-discern issue on the production line. When reached for comment by Roadshow, Toyota safety spokesperson Victor Vanov said, "The tolerance for something like this is so minute that the human eye could never detect [it]."

Toyota will begin notifying customers whose cars may be affected with this issue via mail by late May, and dealers will inspect production date codes of the pistons on these engines. If the service techs discover a match with the faulty parts, the entire engine will be replaced at no cost to the customer.

This is the second recall of the 2018 Camry. In February, Toyota issued a campaign notice covering nearly 12,000 V6 models for incorrectly connected fuel lines that could trigger a leak.

Update, 10:49 a.m. ET: Added engine information and a statement from the Toyota spokesperson.