Powertrain, generic · Computer and auxiliary outputs

P064E Internal Control Module O2 Sensor Processor Performance Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Wide-band oxygen sensors need a pump current control; inside the engine module a dedicated chip (ASIC, for example Bosch's CJ125 family) regulates it, measures lambda, diagnoses sensor wiring and heater, and talks to the main processor via SPI. P064E is the bank 2 counterpart of P064D and only occurs on V and boxer engines with two sensors before the catalysts. Ford sets it when the SPI communication with the bank 2 chip fails (10 s; an internal chip fault adds Ford's P1647); GM uses the same error counters as for bank 1 (128 of 160 samples, lamp after two trips). Fuel control on bank 2 then runs open loop, with higher consumption and emissions. Check the bank 2 sensor 1 wiring and sensor first; if they are fine, the engine module is the likely cause.

Likely causes

Engine module (lambda chip bank 2) faulty
Wiring or connector fault of the bank 2 sensor 1
Bank 2 wide-band sensor faulty
Voltage dips or software

Symptoms

  • Check engine light
  • Higher fuel consumption, rough running
  • Failed emissions test
  • Codes for the bank 2 sensor 1 wide-band sensor

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–1,200
Time1–3 h

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

Parts involved

engine control modulewideband oxygen sensorsensor wiring

Related codes

P064DP0151P0152P2240P2254P2629

References: law.cornell.edu, gsi.ext.gm.com, newtonnet.co.uk, fordservicecontent.com.