Powertrain, generic · Ignition system or misfire

P033E Knock/Combustion Vibration Sensor D Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

The knock sensor is a piezoelectric structure-borne sound sensor bolted to the engine block; the module evaluates its signal per cylinder and retards ignition when it detects knock. Sensor D is a fourth sensor on engines with four knock sensors (McLaren 12C V8, Ford's 2020–23 systems). With a fault the module retards ignition across the board as protection – noticeable loss of power and higher consumption. P033E reports brief dropouts of the sensor signal – loose contacts, a wire breaking with engine movement and heat, or a loose sensor. No manufacturer document with a threshold for this code was found; GM and Ford cover such faults with their circuit codes, so the description follows CARB's input monitoring requirement.

Likely causes

Loose contact, spread pins or corrosion in the connector
Wire chafing only with engine movement or heat
Sensor loose or wrongly torqued
Sensor or engine module faulty

Symptoms

  • Check engine light on
  • Loss of power, sluggish response from ignition retard
  • Higher fuel consumption

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–400
Time0.5–4 h

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

Parts involved

knock sensor dknock sensor wiringengine control module

Related codes

P033AP033BP033CP032EP0324

References: law.cornell.edu, bosch-mobility.com.