Aston Martin diagnostic trouble code
P0104: Intermittent MAF sensor signal
Use this reference to understand the recorded condition, confirm the available V8 Vantage or DB9 manual coverage, and follow the documented diagnostic checks before replacing parts.
- Code family
- Powertrain
- Vehicle system
- Fuel and air
- Manual coverage
- V8 Vantage, DB9
- Warning-lamp status
- V8 Vantage: MIL; DB9: MIL
What Aston Martin code P0104 means
Intermittent MAF sensor signal
DB9 preliminary diagnostic manual · section 2-14
Manufacturer fault-analysis procedure
Manual fault definition
P0104 - The MAF signal was intermittent.
Cautions and notes
CAUTION: This code may be generated in the
Primary or Secondary PCM. Check that you are
working on the correct half of the engine.
Primary or Secondary PCM. Check that you are
working on the correct half of the engine.
Test sequence and decision path
1. Connect the WDS or Scan Tool. Check that fault
code P0104 is present. Set the datalogger to monitor both MAF signals.
2. During a brief road test, record both MAF signals
and confirm which sensor is providing an intermittent signal.
3. P0104 can be caused by a contaminated sensor.
Remove the sensor and check for contamination
on the sensor screen. If contamination is present,
replace the MAF sensor and overhaul the air
intake filter system to repair the contamination
source. Retest after reassembly. If P0104 is still
present, carry out the following analysis.
4. For intermittent/erratic signal levels, monitor the
MAF signal with the engine running whilst shaking/wiggling the engine harness between the
MAF sensor and the PCM.
If any inconsistency is identified, service the
affected part of the harness as necessary. Clear
the P0104 code and run a KOER test to ensure
that the problem is resolved.
Open the corresponding manual page for wiring diagrams and figures
code P0104 is present. Set the datalogger to monitor both MAF signals.
2. During a brief road test, record both MAF signals
and confirm which sensor is providing an intermittent signal.
3. P0104 can be caused by a contaminated sensor.
Remove the sensor and check for contamination
on the sensor screen. If contamination is present,
replace the MAF sensor and overhaul the air
intake filter system to repair the contamination
source. Retest after reassembly. If P0104 is still
present, carry out the following analysis.
4. For intermittent/erratic signal levels, monitor the
MAF signal with the engine running whilst shaking/wiggling the engine harness between the
MAF sensor and the PCM.
If any inconsistency is identified, service the
affected part of the harness as necessary. Clear
the P0104 code and run a KOER test to ensure
that the problem is resolved.