Volvo AWD 850 Forum

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95' 850 T-5 Fault codes A2 (4-1-4 / 1-2-1) & B2 (1-3-5) 850

posted by  someone claiming to be por356s on  Tue Jul 9 18:11 CST 2002 [RELATED]

Need Help .. First off, B2 (1-3-5) no signal from ECT sensor .. I just replaced the sensor to fix the code and nothing changed (code) . Is there any other reason this code would appear ??? Second, A2 (4-1-4) Turbo boost pressure to high .... How can I cure this ????? And last of all, A2 (1-2-1) MAF sensor signal absent or faulty... Could any of the other problems cause this or could this be the source of any of the previous problems ???? any comments would be greatly appriciate !!!!!!!!!!








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    95' 850 T-5 Fault codes A2 (4-1-4 / 1-2-1) & B2 (1-3-5) 850

    posted by  someone claiming to be Chris on  Wed Jul 10 13:58 CST 2002 [RELATED]

    There is no 135 in b2 in b1 135 is ect sensor no freq. signal, but that's climate control. Do the lights on the climate control panel flash? if they flash for 20 seconds it's a minor fault, longer it's a major fault. you may be running too lean or have an electrical problem, I'll look in the manual at work tomorrow, I'm fairly interested in the 414 code. Have you tried to clear them?
    BTW, a dirty throttle plate can cause the 121 code.








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      95' 850 T-5 Fault codes A2 (4-1-4 / 1-2-1) & B2 (1-3-5) 850

      posted by  por356s on  Wed Jul 10 16:45 CST 2002
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      Chris, Thanks for your imput ... I am going to flush the coolant tomorrow and try again,, Yes, the climate control lights blink .. I coundn't for the life of me figure out what in the hell that ment.. Thanks.. I have not cleaned the throttle plate, but will in the morning .. It was the B1 and not the B2 ... I did replace the thermostat and ECT sensor and still got the 1-3-5 (??) .. My "check engine" light is on.. Thanks again.. Curtis







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