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Discussion Starter #1
Hi everyone
Firstly, I would like to apologize as my knowledge in cars is very limited.
Recently, I had a blown headgasket on my 2010 Peugeot 207 millesim with ~49000 miles and was replaced back in March. After the replacement, i've been getting engine management light (anti pollution fault) and have replaced several parts.

The pre-cat lambda sensor was replaced.
The CEL came back on again and was diagnosed with the code P2270 - so I had the post-cat lambda sensor replaced. MPG went up, which is good, but the CEL came back on again with the following errors:
P2270 - O2 Sensor Signal Stuck Lean Bank 1 Sensor 2
P0136 - O2 sensor circuit bank 1 sensor 2
P0053 - HO2S heater resistance bank 1 sensor 1
Anyone have any idea or suggestions on what is wrong with the car?
I'm starting to lose patience with the car as I have taken it back to the garage multiple times and they seems to have no idea what's wrong with it.
 

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The P2270 is likely to be a similar fault to the P0053

But, the fault codes may not be the same as generic codes, depending on the engine
Just checked the connections and they look fine with no corrosion.
I have also checked both sensors with the multimeter and I have a reading of 15 and 8 ohms for the post and pre cat. Do you know what the ideal reading should be?
 

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remember getting a lambda warning years ago, just cleared it with pp2000 and it never came back.

does make you think how many problems are real, and how many due to a confused bsi.
 

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Just checked the connections and they look fine with no corrosion.
I have also checked both sensors with the multimeter and I have a reading of 15 and 8 ohms for the post and pre cat. Do you know what the ideal reading should be?
Not sure about the resistances.

The lambda reading ought to be 1.00 +/- 0.03. The voltages on the sensor is very small, normally less than a volt.
 
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