Technical Persistent Check Engine Light

[Charlie99]

Hi

I've a 2017 1.4 T-Jet TIPO, and for the last few months I've been plagued by a check engine light (aside from a fluctuating range calculation on the dash, there are no other issues). After plugging in my diagnostic tool, I get the following errors:

P0136 - 02 Sensor Circuit (Bank 1, Sensor 2)
P0054 - H02S Heater Resistance (Bank 1, Sensor 2)
P0136 - 02 Sensor Circuit (Bank 1, Sensor 2)

I've taken the car to two separate garages, both initially identified a dodgy lambda sensor, which was replaced. Unfortunately after about a week the light came back on and this time I was told there was something wrong with a flexhose, which has also now been replaced. Less than an hour after driving off the garage forecourt the light has come back on!

I'm at a complete loss and can't afford to keep putting money into repairs that aren't actually solving the issue. Does anybody have an ideas on what might be causing this?

 

[AnthonyH]

It'd be an exhaust leak or the wiring on the sensor most likely. Can you check for an exhaust leak yourself?

 

[elmolfc]

When I had my reoccuring engine light, I was in the same boat. The car has 2 lamba sensors, one on the engine side and one on the exhaust side. Do you know if both were replaced? Apparently it is recommended to replace them in pairs. Good luck.

 

[Mike1alike]

The sensor that came up in the errors is the one after cat. Is that the one they've replaced?
Are you getting the same errors now or is there something different?

 

[EUR0]

Hi, check that the replaced O2 sensors are original FCA (Delphi) parts. The non-original o2 sensors may not be t-jet compatible causing errors coming back.