P3191 on Lexus

On Toyota hybrids, the engine did not start when the hybrid system asked it to

Severity: Inspect soon

Toyota bulletins pair this code with a lit warning lamp and a failed engine start; the car may lose its engine or not start, so get it checked soon.

It gets more serious if:

Stop: Stop somewhere safe if the engine will not start, the master or hybrid warning is on with a stop message, or power drops. Repeated start attempts can drain the hybrid battery, per CarSpecMN.

Safety-critical system: explanation only, no DIY steps. Source: how we rate severity

This page covers only what differs on Lexus. For what P3191 means, the ranked causes and the test order, see the P3191 guide.

What's different on Lexus

Lexus

2011–2013 · CT
Supported by vehicle data
CT 200h: Lexus bulletin L-SB-0019-15 covers the same purge line condition.

L-SB-0019-15Status unverified
P0A0F with possible P3190 and P3191 on CT 200h
2011–2013ct · issued August 14, 2017 · NHTSA 10111152
Same purge VSV/PCV line condition as T-SB-0041-15.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Sources and review

L-SB-0019-15: P0A0F on the CT 200h — Lexus
T-SB-0041-15: P0A0F with P3190 and P3191 on Prius and Prius v — Toyota Motor Sales
TSB-0205-11 Rev 1: P0A0F, P3190 and P3191 engine computer logic — Toyota Motor Sales
2001-2009 Prius P3191, P3190, P0A0F quick checks — CarSpecMN

Last reviewed: October 16, 2026
Written by: Saurabh K.
Editorial review: Pending
Technician review: Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error