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Click FAQ above, the Volvo 700-900-90 series FAQ, yet a few links here from the FAQ:
https://www.brickboard.com/FAQ/700-900/EngineSensors.htm
See:
Regina Air Temperature Sensor
Regina Manifold Air Pressure Sensor
https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm
See:
Regina (fuel injection and emissions control) Fault Codes
Rex (ignition and emissions control) Fault Codes
DTM 1: 1. Diagnostic Test Mode 1: Fault Code Retrieval procedure is a good start.
Though other issues or sensor faults or fault conditions may effect performance and economy.
Others with current and more recent Bendix Rex / Regina can better help you.
There may be Volvo green factory manuals in PDF form posted on the internets.
The Volvo Tips site may help, yet much information are scans of printed manuals transferred to Adobe Shockwave flash (swf) files, so you need flash player.
Hope that halps.
MacDuffed.
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