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"Replaced sensor (Bosch number 0 280 130 026)"
No wonder the CEL. That one is for earlier (LH 2.2) FI systems.
You need the black top 0 280 130 032.
The blue 026 is a single element sensor, with one pin for sensing and the other going to ground.
The 032 is dual element, one pin for FI ECU and one for Ignition CU, both elements grounded internal to sensor body and engine.
Here it is at FCP Groton (good price, same Bosch OE is about $45)
--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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