P2193 System Too Lean at Higher Load (Bank 2)

P2193 reports for bank 2 what P2191 reports for bank 1: in the upper load zone the long-term trim of that bank sits at its enrichment limit. It only exists on engines with a separate front sensor per bank, such as V6, V8 and boxer engines. The useful question is whether bank 1 shows the same. Lean at high load on both banks (P2191 with P2193) points to something they share, chiefly fuel pump, filter, pressure regulation or the air mass sensor. Bank 2 alone narrows it to that side: injectors on bank 2, an intake gasket or runner leak there, or an exhaust leak ahead of the bank 2 sensor. No manufacturer documents P2193 publicly; GM monitors the comparable range as P2179, and CARB sets the general rule for exhausted fuel adaptation in 13 CCR 1968.2 (e)(6.2.2).

Likely causes

Symptoms

• Check engine light on
• Hesitation under heavy acceleration
• Bank 2 long-term trim much higher than bank 1 at high load

Repair estimate

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

Parts involved

Related codes

References: law.cornell.edu, gsi.ext.gm.com.