Engine 850: B5252S/2.4/10v: - A2 code 5-2-1 & A3 code 4-4-4....

phatboy130 · Sep 23rd, 2011, 14:57

Hi Guys,

I have done several hundred miles over the past 2 weeks due to having to sort out the sudden passing away of a family member, bit of a shock to the car as it doesn't do very miles at each year, did 1k between the last MOT's lol.

Lamda light has come on, disco'd the battery, checked codes, I have A2 code 5-2-1, and A3 one (abs) is 4-4-4, altho this one is always there, I queried it while ago, it points to a faulty solenoid power supply or suchlike, but the abs works fine so have been advised to ignore it, as it appears that it does crop up on some cars.

Re the 5-2-1, am I right this is the front o2 sensor?, is there any connections I can try cleaning? And is the car ok to pootle about in short term? DIY'able? Cost for part?

Many thanks for your advice guys.

RXS · Sep 23rd, 2011, 15:19

A2 521= oxygen sensor heating faulty A3 444 no power supplyto hydraulic modulator valves

phatboy130 · Sep 23rd, 2011, 20:21

Hints or tips anyone? How about a known good one from a breaker?

Chris_Rogers · Sep 23rd, 2011, 22:20

Replace with a new genuine sensor or a secondhand genuine, just don't waste time or money on universal/cheap ones.

phatboy130 · Sep 23rd, 2011, 23:37

Quote:

Originally Posted by Chris_Rogers

Replace with a new genuine sensor or a secondhand genuine, just don't waste time or money on universal/cheap ones.

What's up with the cheaper / uni ones? Don't they all work the same then? I don't normally do many miles, couple thou a year at most, so don't need super longevity lol...

Chris_Rogers · Sep 24th, 2011, 08:44

It's not a question of longivity, they just don't work with the Volvo engine management system.

Sep 23rd, 2011, 14:57	#1
phatboy130 1999 V70 XT Auto Last Online: Yesterday 21:51 Join Date: Aug 2009 Location: Devon	A2 code 5-2-1 & A3 code 4-4-4.... Hi Guys, I have done several hundred miles over the past 2 weeks due to having to sort out the sudden passing away of a family member, bit of a shock to the car as it doesn't do very miles at each year, did 1k between the last MOT's lol. Lamda light has come on, disco'd the battery, checked codes, I have A2 code 5-2-1, and A3 one (abs) is 4-4-4, altho this one is always there, I queried it while ago, it points to a faulty solenoid power supply or suchlike, but the abs works fine so have been advised to ignore it, as it appears that it does crop up on some cars. Re the 5-2-1, am I right this is the front o2 sensor?, is there any connections I can try cleaning? And is the car ok to pootle about in short term? DIY'able? Cost for part? Many thanks for your advice guys.

Sep 23rd, 2011, 15:19	#2
RXS manic monkey Last Online: Mar 9th, 2019 13:08 Join Date: Jan 2010 Location: Kent	A2 521= oxygen sensor heating faulty A3 444 no power supplyto hydraulic modulator valves

Sep 23rd, 2011, 20:21	#3
phatboy130 1999 V70 XT Auto Last Online: Yesterday 21:51 Join Date: Aug 2009 Location: Devon	Hints or tips anyone? How about a known good one from a breaker?

Sep 23rd, 2011, 22:20	#4
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	Replace with a new genuine sensor or a secondhand genuine, just don't waste time or money on universal/cheap ones.

Sep 24th, 2011, 08:44	#6
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	It's not a question of longivity, they just don't work with the Volvo engine management system.

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