Technical Help Error Codes PO135, PO202 and PO300

[BogdanXB]

Hi there. Could anyone please give me some constructive suggestions. I have a brava 1.6 2001, the check engine light came up and it started shaking, running on 3 cylinders like. I changed the sparks but no difference, it seems to get worse every time I start the engine. I took it to the service for a diagnostic and the error codes given were PO135-O2 Sensor Heater Circuit Bank 1 Sensor 1, PO202-Cylinder 2 Injector Circuit and PO300-Random Cylinder Misfire. Any ideas of what could it be? As the misfire changes from one cylinder to another, could it still be an injector at fault? or the ignition coil.. Thanks a lot

 

[fiat_-_bravo]

Probable Causes:

P0135 - Could be a Fuse, the O2 sensor, the wiring, or the engine control unit.

P0202 - The Wiring, a faulty injector, or the engine control unit.

P0300 - Spark Plug/s (although as you have changed them it's safe to rule the plugs out), HT Lead/s, Injector/s, ignition Coil/s, low compression or again a wiring fault.

 

[OG Burrows]

does anyone know where the O2 sensor fuse is located? as i replaced my lambda sensor and the code (p0135) remained..

 

[Stephen505]

does anyone know where the O2 sensor fuse is located? as i replaced my lambda sensor and the code (p0135) remained..

Did you locate the Fuse as I have the same issue and wish to start from the fuse.