On some 2012-2014 Toyota Corolla vehicles equipped with a 2ZR-FE engine and 2012-2013 Matrix vehicles with the same engine, the MIL may be on, with DTC P219A (bank 1 air-fuel ratio imbalance) present. There may be compression loss in the exhaust.
Using Techstream, check for DTCs and confirm the condition is present. If misfires are present, this bulletin does not apply. If no misfires are present, perform a cylinder leak-down test on each cylinder. Note any cylinders with a high compression loss percentage. If compression loss is found, listen to the exhaust, intake and crankcase to determine the source of the leakage.
Replace the cylinder head and all exhaust and intake valves for the affected cylinder(s).
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety ofspecialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.
