Powertrain, generic (extended)

P219E Cylinder 3 Air-Fuel Ratio Imbalance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P219E points at cylinder 3. Two bulletins show that a mixture code does not always mean a fuel part. Audi stored P219C to P21A1, one code per affected cylinder, on 2010 to 2012 S4, S5 and A6 with the 3.0 TFSI because of an incorrect software setting; the fix was new engine software and, in a later revision, a new crankcase pressure regulating valve. Lexus traced P219A and P219C to P219F on the 2.0 turbo 8AR-FTS (NX, IS, RC, GS 2015 onward) to compression lost through exhaust valves with worn guides, sometimes with misfire codes and reduced engine power, and repaired the cylinder head. Toyota's 2015 Tacoma V6 bulletin also starts with a leak-down test. For a lone P219E, test the cylinder 3 injector and compression before replacing sensors; the bank sensor itself is shared by all cylinders.

Likely causes

Exhaust valve leakage at cylinder 3 (e.g. worn guides on Lexus 8AR-FTS)
Cylinder 3 injector delivering the wrong amount
Incorrect ECM software setting (e.g. Audi 3.0 TFSI)
Faulty crankcase pressure regulating valve

Symptoms

  • Check engine light on
  • Possible P0303 or rough running
  • Reduced engine power in severe cases

Repair estimate

DifficultyHardWorkshop job
Parts and labour€0–2,500
Time0–10 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injector

Related codes

P219AP219DP219FP0303

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.