P064E code meaning
Internal Control Module O2 Sensor Processor Performance Bank 2
Powertrain system Generic code P06xx codes Check engine light
What P064E means
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.
P064E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor1 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P064E
- Check engine light
- Higher fuel consumption, rough running
- Failed emissions test
- Codes for the bank 2 sensor 1 wide-band sensor
Common causes of P064E
- Most likelyEngine module (lambda chip bank 2) faulty
- PossibleWiring or connector fault of the bank 2 sensor 1
- PossibleBank 2 wide-band sensor faulty
- Less likelyVoltage dips or software
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine control moduleWideband oxygen sensorSensor wiring
What each part of P064E means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 4E | The exact fault in that area. |
What to do next
- Note P064E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P064E
What does P064E mean?
P064E means "Internal Control Module O2 Sensor Processor Performance Bank 2". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P064E?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P064E fail an emissions test?
Yes, it can. P064E is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P064E to fix?
Difficulty: hard. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will P064E clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.