VOLVO
ECM-P042000 - Catalyst System Efficiency Below Threshold (Bank 1). General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
14 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V50 (2004–2013), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (39)
- Volvo C30 (2007–2013)2011–2013Engine D5204T, D5204T5 only
- Volvo C70 (2006–2013)2011Engine D5204T, D5204T5 only
- Volvo C70 (2006–2013)2012–2013All engines except: B5254T7
- Volvo S40 (2004–2013)2011–2012Engine D5204T, D5204T5 only
- Volvo S60 (2011–)2011Engine B5254T5, B6304T4, D5204T2, D5244T10 only
- Volvo S60 (2011–)2012Engine B5254T5, B6304T4, D5204T3, D5244T11, D5244T15 only
- Volvo S60 (2011–)2013–2014All engines except: B4164T, B4164T2, B4164T3, B4204T7, D4162T
- Volvo S60 (2011–)2015All engines except: B4164T, B4164T2, B4164T3, D4162T
- Volvo S80 (2007–)2007All engines except: D5244T4, D5244T5
- Volvo S80 (2007–)2008–2009All engines except: D4204T, D5244T4, D5244T5
- Volvo S80 (2007–)2010All engines except: B4204T6, D4164T, D4204T
- Volvo S80 (2007–)2011All engines except: B4164T, B4204T6, B4204T7, D4164T
- Volvo S80 (2007–)2012–2014All engines except: B4164T, B4164T2, B4204T6, B4204T7, D4162T
- Volvo S80 (2007–)2015All engines except: B4164T, D4162T
- Volvo V40 (2013–)2013All engines except: B4164T, B4164T3, D4162T
- Volvo V40 (2013–)2014–2015All engines except: B4164T, B4164T3, B4164T4, D4162T
- Volvo V40 Cross Country (2013–)2013–2015All engines except: B4164T, D4162T
- Volvo V50 (2004–2013)2011–2012Engine D5204T, D5204T5 only
- Volvo V60 (2011–)2011Engine B6304T4, D5204T2, D5244T10 only
- Volvo V60 (2011–)2012Engine B6304T4, D5204T3, D5244T11, D5244T15 only
- Volvo V60 (2011–)2013–2014All engines except: B4164T, B4164T2, B4164T3, B4204T7, D4162T
- Volvo V60 (2011–)2015All engines except: B4164T, B4164T2, B4164T3, D4162T
- Volvo V60 Cross Country (2015–)2015
- Volvo V70 (2008–)2008–2009All engines except: D4204T, D5244T4, D5244T5
- Volvo V70 (2008–)2010All engines except: B4204T6, D4164T, D4204T
- Volvo V70 (2008–)2011All engines except: B4164T, B4204T6, B4204T7, D4164T
- Volvo V70 (2008–)2012–2014All engines except: B4164T, B4164T2, B4204T7, D4162T
- Volvo V70 (2008–)2015All engines except: B4164T, B4164T2, D4162T
- Volvo XC60 (2009–)2009Engine B6304T2 only
- Volvo XC60 (2009–)2010All engines except: B4204T6
- Volvo XC60 (2009–)2011–2012All engines except: B4204T6, B4204T7
- Volvo XC60 (2009–)2013–2015All engines except: B4204T7
- Volvo XC70 (2008–)2008Engine B6324S only
- Volvo XC70 (2008–)2009Engine B6304T2, B6324S only
- Volvo XC70 (2008–)2010–2015
- Volvo XC90 (2003–)2005–2006Engine B8444S only
- Volvo XC90 (2003–)2007–2010Engine B6324S, B8444S only
- Volvo XC90 (2003–)2011Engine B6324S5, B8444S only
- Volvo XC90 (2003–)2012–2014Engine B6324S5 only
What does this fault code mean?
The ECM alternates the fuel mixture between rich and lean and compares the rear oxygen sensor signal with the front one. If the rear sensor switches too quickly, this is read as reduced efficiency of the bank 1 catalytic converter, and the code is set when efficiency falls below the limit.
Possible causes
- Misfiring
- Air leak in the exhaust or intake system
- Faulty fuel pressure or uneven compression
- One or more injectors damaged or blocked
- Damaged front heated oxygen sensor (bank 1)
- Damaged or removed catalytic converter (bank 1)
What you can do
- 1Check the exhaust system for air leaks, especially at joints and seams
- 2Look for air leaks in the intake system, for example at hoses and connections
- 3If you have a diagnostic tool, read the fault status and check that the oxygen sensors have not been swapped at the catalytic converter
- 4Use a multimeter to check that the signal wire to the oxygen sensor is not short-circuited to ground (the body)
- 5Have a workshop check the fuel pressure and the engine compression, since this needs measuring
- 6If the fault remains after this, have a workshop assess whether the front oxygen sensor or the catalytic converter needs attention
Symptoms you may notice4
- The Check engine (malfunction indicator) light comes on or behaves abnormally
- The engine stalls at idle, at times that are unclear or all the time
- The engine does not start or only cranks, at times that are unclear or all the time
- The car performs poorly and lacks power
What the fault can affect1
- Control using the rear oxygen sensor is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.