Dear all, When I went in my garage this morning, my goal was to replace the FPRs.... but I saw that on the left side, the oxygen sensor wires are destroyed by the boot clamp of the wheel shaft..... So I have to replace it (348 with 2.5 ECU). when I check the cross reference guide, it seems that the mentioned original Bosch sensor (13120) has 4 wires... Do you have the right ref nb? May i use a standard bosch sensor and weld the old connectors? If yes, what is the ref ? but I need the followed connexions. Image Unavailable, Please Login
Is that a 3-wire sensor? Otherwise, you can get the 4-wire ones at a very good price here: https://www.ebay.co.uk/itm/Lambda-Sensor-for-ALFA-ROMEO-FIAT-LANCIA-VOLVO-FERRARI-INNOCENTI-155-167-850-LS/352917884753?epid=248862092&hash=item522b8b8f51:gc8AAOSwbaxbYaY1
And here's a sensor (from the same Ebay seller) with connections that look like whet you have: https://www.ebay.co.uk/itm/Lambda-Sensor-for-AUDI-RENAULT-ZASTAVA-CHRYSLER-DODGE-COUPE-89-8B-ABC-AAH-AAE/402021455937?hash=item5d9a589841:g:1uUAAOSwlLlb6qUK
Easy to get and cheap. I found this info: 0 258 003 009 - 700 mm long, superseded by: 0 258 003 957 - 1236 mm long (https://spareto.co.uk/products/bosch-lambda-sensor/0-258-003-957) The second number is also available on Ebay.
It is quite possible that your engine (one bank, I believe) running rich was caused by the faulty O2 sensor. When an O2 sensor goes bad or is disconnected, the ECU will go into the "open loop" mode on that bank. In such a case, the position of the adjuster screw on the MAF comes into play. The adjuster screw is a potentiometer actually connected to the ECU only, not to any part of the MAF circuitry. If your adjuster screw is positioned at "rich" you would then have the symptoms you earlier described - hard to start when hot, petrol smell, rich running. So, before you install a new O2 sensor, check the position of the adjuster screw on both MAFs - unplug the connector and connect an ohmmeter to the pins 1 & 6 (the two outer pins) of the MAF. The reading should be ~ 383 Ohm. If not, turn the adjuster screw until you get this value.
