1.9 16v Multijet diesel fault code
Discussion
Hello.
Just wondered if we have any technical bods.
I have the FiatEcuScan program and every few days PO2A00 fault code keeps popping up, this does not activate the engine light. but the car does not feel quite right
After google search this code comes bach as lambda sensor high voltage reading?
Has anybody had this before?
Just wondered if we have any technical bods.
I have the FiatEcuScan program and every few days PO2A00 fault code keeps popping up, this does not activate the engine light. but the car does not feel quite right
After google search this code comes bach as lambda sensor high voltage reading?
Has anybody had this before?
http://www.petercoopercarrepairs.co.uk/new_page_3....
The voltage reading from the lambda sensor is often a very good place to start with your diagnose of an emissions failure fault. The lambda sensor can be used as a pre-cat emission tester when used with either an accurate voltmeter or an oscilloscope. With the engine up-to normal working temperature, check the output of the sensor wire, normally black with Zirconia sensors, you should expect an output of 0.2 – 0.8 volts fluctuating between these reading approximately 2 – 3 times per second. If the output voltage is lower than this, i.e. 0 – 0.2 volts there will be a lean running or excess oxygen problem. If the voltage is higher than this, i.e. 0.8 – 1.2 volts then there will be a rich running or excess fuel fault. A point to note is that conventional Zirconia sensor is not capable of producing a voltage above about 1.3 volts; if the voltage exceeds this then there will probably be an earth fault with the sensor. Some cars notably Rover have different requirements in respect to internal lambda connections, should you measure a voltage above 1.3 volts it might be worth checking for a lambda sensor mismatch fault.
If the fault is a high lambda reading, with a high O2 reading but with normal CO and HC readings, the most common cause is post combustion air leaks. A small exhaust system air leak will leak air into the exhaust before any blows can be detected. Only a small volume of clean air introduced into the exhaust will cause a car to fail the MOT test.
The voltage reading from the lambda sensor is often a very good place to start with your diagnose of an emissions failure fault. The lambda sensor can be used as a pre-cat emission tester when used with either an accurate voltmeter or an oscilloscope. With the engine up-to normal working temperature, check the output of the sensor wire, normally black with Zirconia sensors, you should expect an output of 0.2 – 0.8 volts fluctuating between these reading approximately 2 – 3 times per second. If the output voltage is lower than this, i.e. 0 – 0.2 volts there will be a lean running or excess oxygen problem. If the voltage is higher than this, i.e. 0.8 – 1.2 volts then there will be a rich running or excess fuel fault. A point to note is that conventional Zirconia sensor is not capable of producing a voltage above about 1.3 volts; if the voltage exceeds this then there will probably be an earth fault with the sensor. Some cars notably Rover have different requirements in respect to internal lambda connections, should you measure a voltage above 1.3 volts it might be worth checking for a lambda sensor mismatch fault.
If the fault is a high lambda reading, with a high O2 reading but with normal CO and HC readings, the most common cause is post combustion air leaks. A small exhaust system air leak will leak air into the exhaust before any blows can be detected. Only a small volume of clean air introduced into the exhaust will cause a car to fail the MOT test.
Lambda fault...on a diesel???
wrinx
CPC said:
PO2A00 fault code
Not wanting to be rude...but are you sure this is correct, a quick google doesn't show anything? The fault code list here (best I've found) http://www.kbmsystems.net/obd_fault_codes_db.asp doesn't show anything like it, unless it's P0200 which is injector circuit malfunction.wrinx
Edited by wrinx on Thursday 29th December 22:20
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