Author Topic: Lambda sensor or DPF  (Read 147 times)

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Offline Gloss123

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Lambda sensor or DPF
« on: May 14, 2018, 06:54:09 pm »
Hi guys would really be interested in anyone's experience, knowledge on my issue please. Bought a 63 plate sport Nav 2.2 diesel, 175 hp in November last year. Lovely car really impressed as it's my first mazda, 73 k on clock fully service history. Problem started last week, just had it's recent service a week ago, then I got engine management light come on on Friday evening, didn't go on any major trips during weekend and no issues with the car driving. Monday morning driving to work DPF soot level high error message came up. Stopped car rang my mechanic and on his advice took it for e spin up m6 for 45 minutes in fourth averaging about 60mph. On way back error message came up DPF needs inspecting!  From bad to worse in 2 hours and the first ever messages that I have had come up regarding the DPF. Car went into mechanics day after, he cleared the DPF  messages but couldn't clear the engine management light, because it said primary oxygen sensor fault, because of this fault he couldn't force the car to regen. I am now having trouble where to get the lambda sensor from, anyone got any ideas as no of seems to stock it. Don't want to Say through more with Mazda. Has anyone else had this issue. I am hoping the oxygen sensor is what has tripped the DPF errors, as they hadn't appeared before. I'm hoping the DPF isn't shot. I could understand if I had been driving round ignoring the error message for a few months, but to go from bad to worse in two hours seems like a glitch caused by this lambda oxygen sensor.
« Last Edit: May 14, 2018, 06:57:03 pm by Gloss123 »

Offline apav

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Re: Lambda sensor or DPF
« Reply #1 on: May 15, 2018, 08:54:32 am »
Is this a third generation car? The second generation cars has a multi functioning DPF light that indicated the service interval, the damaged timing chain and the DPF problem all at one go and you had to guess what was what.

It is super easy to block the DPF. It only takes a couple of thousands miles of proper abuse and it is blocked. But if you have rooted the problem to the sensor, go for it. But it does not sound like that the garage is convinced. If the sensor causes the engine management light, then there is a possibility that affects the DPF but is this the case?

Offline Gloss123

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Re: Lambda sensor or DPF
« Reply #2 on: May 15, 2018, 04:09:41 pm »
Hi Apav

Thanks for your comments, Im assuming 3rd Gen as its a 2013 plate (63) and VIN is JMZGJ692621140783.
There doesn't appear to be a DPF warning light, just a message in the digital display saying "Soot levels in DPF too high" and "DPF needs inspection" but no dedicated DPF light like the engine management light has.

I think myself and the garage are assuming this as there was only a 25 mile journey between the engine management light coming on Friday afternoon and then first DPF message coming on on the Monday morning, then a further 60 miles on M6 doing a steady 60 in fourth to try and get it to enter a regen cycle before the second DPF message came up. All this seems way to quick to get a first DPF message then the second, so it would seem very bad luck to have it knackered in 3 days and 75 miles.

Our problem know is trying to get hold of a new lambda sensor, no one seems to stock them, and those that do want a part number which we dont know, and Mazda wont tell me the part number over the phone they want to charge me to take it in and have a look. Which I am resisting at the moment as I think its a dam cheek to be charged £80 for a part number code.


Offline apav

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Re: Lambda sensor or DPF
« Reply #3 on: May 16, 2018, 09:22:02 am »
Yes it says GJ on the VIN, so it is the third generation.

As it is the engine management light that came up first and the scanner recognises this as this primary oxygen sensor, discuss this with the dealer and ask them whether that could fix the problem and how much the sensor costs. The dealer may say that they do not know whether it is the sensor and they want to get paid for inspection but at least you will know how much it costs.

If you google Mazda 6 GJ primary oxygen sensor, there is a company selling them:

https://www.bestpartstore.co.uk/exhaust-system/oxygen-sensor/mazda/6-y2013

The most expensive is this one:

https://www.bestpartstore.co.uk/7563572-herthbuss-jakoparts-lambda-sensor

If I was you, I would ask the garage to remove the sensor, clean it, use contacts spray on the connections and try it again.

If there is no progress, you may need to buy the sensor and try it.

Check your manual what is the speed that you need to keep going to regenerate the DPF. In the second generation car, that is 25mph. Then compare your average speed on the trip computer. If that figure is higher, then you are doing well and it all seems to be down to the sensor especially if this is the first time the problem came up. You may have bought an ex-company that was driving all the time and now during these six months of ownership, you drive it differently. But then it is the DPF that should come up and not the sensor.

Offline Gloss123

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Re: Lambda sensor or DPF
« Reply #4 on: May 16, 2018, 05:17:20 pm »
Great reply Apav, I appreciate your opinion and advice. I called the main dealer this morning, and they said there was no part listed as an oxygen sensor or lambda sensor. Apparently the DPF on my model is not in the exhaust line under the car, it's just next to the manifold. There are only 2 sensors, an air / fuel sensor after the DPF and a temp sensor  in the DPF. they told me to go back to my mechanic to find out which sensor the error code is pointing to to make sure I purchase the correct part, as they are none refundable.prices are £180 or £230 dependant on which one. I will keep you posted on how it turns out, as it's going to be useful for anyone else with the same problem.