GT 2.0 JTS Lambda/Fueling Faults - Alfa Romeo Forum
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JayWard's Avatar
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GT 2.0 JTS Lambda/Fueling Faults

I was wondering if anyone could shed any light or advice with regards to my faults on my GT 2.0 JTS. I am getting the engine light on and it bogs down on power around 3000 revs. Then feels really sluggish and revs slowly above this rev range. It smells of over fuelling and has lost mpg. It also has a high hydrocarbon rating on an emissions machine.

here are the fault codes (from Delphi):

P0156 - O2 Sensor Circuit Malfunction (Bank 2 Sensor 2) - Intermittent
P1161 - Lambda 2 heater below catalyst - Present
P1172 - Mixture 1 strength (multiplicative) - Intermittent
P1175 - Mixture 2 strength (multiplicative) - Intermittent
P0161 - O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2) - Present
P1141 - Lambda 1 heater below catalyst - Present
P0136 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 2) - Present
P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2) - Present
P0571 - Cruise Control/Brake Switch A Circuit Malfunction - Intermittent
P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) - Intermittent
P0155 - O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1) - Intermittent

As you can see all the faults are related to lambdas or mixture. Surely they wouldn't all fail?

I should of attached a copy of the live data from the vehicle aswell, from idle then to 2.5k around 10 seconds and back to idle around 23 seconds.

Any help appreciated.
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JayWard is offline  
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When you clear these codes, do they all come back straight away? Has someone sneakily unplugged all your lambdas? Maybe there's a fuse for the lambda heater circuits
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The JTS has had issues with poor connections to the Lambda sensors from day one.
They often ended up with the connectors bypassed completely, but the issue was a design fault in the connector which meant the pins weren't properly in the sockets.
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any luck fixing this?
I have the following codes today with rough idle and cutting out,

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faults , jts , lambda or fueling

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