When you need to return, exchange and refund, please contact us first.
Specification:
* Line length: 1200mm+1550mm+550mm+470mm
* 5+4 wire configuration
* Interchange Part Number: 234-5138，234-5139，234-4876，234-4892
* Package Include 4 x Oxygen Sensor
Warranty: 3 year
Fit Vehicles:
Please see compatibility chart.
BMW
323I 2.5L L6 2010 2011
128I 3.0L L6 2008 2009 2010 2011 2012
328I
3.0L L6 2007 2008 2009 2010 2011 2012
3.0L L6 Turbocharged 2012 2013
328XI 3.0L L6 2007 2008
528I 3.0L L6 2008 2009 2010
528XI 3.0L L6 2008
X3 3.0L L6 2008 2009 2010
X5 3.0L L6 2008 2009 2010
Z4
3.0L L6 2008 2009 2010 2011
3.0L L6 Turbocharged 2011 2012
1 SERIES M 3.0L L6 Turbocharged 2011
135I 3.0L L6 Turbocharged 2008 2009 2010
335I 3.0L L6 Turbocharged 2008 2009 2010
335IS 3.0L L6 Turbocharged 2011 2012
335XI 3.0L L6 Turbocharged 2007 2008
"Please check the part number and item pics clearly, confirm suited to your needs.”
（It is best to note that your car model is in the order
when you place an order, so that we have dedicated technicians to help you
check whether the product you have purchased matches your car model. Thank you）
Must Know Before Buying:
The following information is for instructional and guidance reference only. We try and make them as accurate as we can.
If Check Engine Light is on or an OBDII Trouble/Fault code occurs after installation, check the sensor with a voltmeter as below.
If the sensor is good, further diagnosis is required. There're many different codes for specific functional failures, which are NOT necessarily relevant to the sensor. Find out what the Code means before leaving any feedbacks.
Items that have been installed, altered or contaminated are non-returnable.
1. ONLY a defective sensor after tested by a voltmeter is applied to manufacturer warranty.
2. 20% restocking fee is required if buyer bought wrong items due to not paying attention to fitment information and ask for return.
The Price, Quality & Functionality of the O2 Sensor is fully covered under our warranty & return policy. However, refund for any labor cost, expense in a dealer shop or damage due to wrong installation is NOT covered.
Q: How do I know the O2 sensor is good or not?
A: The only way to know if the O2 sensor is functioning normally is to check its responsiveness to changes in the air/fuel mixture, by Voltage Measurement or Waveform Simulation.
Use a 10-megaohm digital voltmeter. Hook up the voltmeter's red probe to the sensor's signal wire and the black probe to engine ground. (Use back probe method, DO NOT pierce the wire.) For a good sensor, voltage should fluctuate constantly between 0.1 and 0.9 volts after starting the engine for 2 or 3 minutes.
