Powertrain, generic · Fuel and air metering, auxiliary emission controls

P006B MAP - Exhaust Pressure Correlation

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

On engines with an exhaust pressure sensor, mostly turbocharged diesels, the control module checks whether manifold pressure and exhaust back pressure fit each other, for example with the engine stopped, when both should be at ambient pressure. P006B is set when they do not. No manufacturer description of this code was found; the explanation follows the general rule for plausibility checks of input sensors. Suspects are the exhaust pressure sensor or its sooted hose, and the manifold pressure sensor. Each sensor can be electrically fine on its own; regulations require such plausibility checks for input sensors with a code of their own.

Likely causes

Exhaust pressure sensor faulty or its hose sooted or blocked
Manifold pressure sensor faulty
EGR or turbocharger fault distorting pressures

Symptoms

  • Check engine light on
  • Often no further symptoms

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–250
Time0.5–1 h

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

Parts involved

exhaust pressure sensorexhaust pressure sensor hosemanifold absolute pressure sensor

Related codes

P0106P0471P0472P0473

References: law.cornell.edu, en.wikipedia.org.